A vaccine against nicotine for smoking cessation: a randomized controlled trial. Extended use of nicotine replacement therapy to maintain smoking cessation in persons with schizophrenia. A randomized trial of nicotine-replacement therapy patches in pregnancy. A 12-week double-blind, placebo-controlled study of bupropion sr added to high-dose dual nicotine replacement therapy for smoking cessation or reduction in schizophrenia. A randomized placebo-controlled clinical trial of 5 smoking cessation pharmacotherapies. Efficacy of a nicotine nasal spray in smoking cessation: a placebo-controlled, double-blind trial. Case studies of three pregnant smokers and their use of nicotine replacement therapy. A randomised controlled trial to evaluate the efficacy of a nurse-provided intervention for hospitalised smokers. Efficacy of a nicotine mouth spray in smoking cessation: a randomised, double-blind trial.
Tobacco dependence is the leading cause of preventable death and disabilities worldwide and nicotine is the main substance responsible for the addiction to tobacco. A vaccine against nicotine was tested in a 6-month randomized, double blind phase II smoking cessation study in 341 smokers with a subsequent 6-month follow-up period.
                229 subjects were randomized to receive five intramuscular injections of the nicotine vaccine and 112 to receive placebo at monthly intervals. All subjects received individual behavioral smoking cessation counseling. The vaccine was safe, generally well tolerated and highly immunogenic, inducing a 100% antibody responder rate after the first injection. Point prevalence of abstinence at month 2 showed a statistically significant difference between subjects treated with Nicotine-Qbeta (47.2%) and placebo (35.1%) (P = 0.036), but continuous abstinence between months 2 and 6 was not significantly different. However, in subgroup analysis of the per-protocol population, the third of subjects with highest antibody levels showed higher continuous abstinence from month 2 until month 6 (56.6%) than placebo treated participants (31.3%) (OR 2.9; P = 0.004) while medium and low antibody levels did not increase abstinence rates. After 12 month, the difference in continuous abstinence rate between subjects on placebo and those with high antibody response was maintained (difference 20.2%, P = 0.012).
                Whereas Nicotine-Qbeta did not significantly increase continuous abstinence rates in the intention-to-treat population, subgroup analyses of the per-protocol population suggest that such a vaccination against nicotine can significantly increase continuous abstinence rates in smokers when sufficiently high antibody levels are achieved. Immunotherapy might open a new avenue to the treatment of nicotine addiction.
                Swiss Medical Registry 2003DR2327; ClinicalTrials.gov NCT00369616. This study was designed to determine the feasibility and efficacy of long-term nicotine replacement therapy (NRT) in helping persons with schizophrenia remain tobacco-free. Fifty smokers with a diagnosis of schizophrenia or schizo-affective disorder and whose symptoms had been stable for at least two months were enrolled in a program providing group support and NRT (patches) in individually adjusted doses set to maintain baseline nicotine intake. All participants attended weekly group support/motivation sessions. Smoking activity was determined by measuring carbon monoxide levels in expired air. Participants who quit tobacco use completely during the first three months were entered into a single-blind phase in which they received either placebo or active nicotine patches for up to six additional months, along with biweekly group sessions. Sixty days into the open-label phase, 66% of the subjects had reduced their use of tobacco by at least 75%. After 90 days of open-label treatment, 18 subjects (36%) were tobacco-free and qualified to enter the six-month, single-blind phase, eight on placebo and nine on active patches. A significantly greater proportion of those on placebo (8 of 8) compared with those on active patches (3 of 9) relapsed prior to completion of the 6-month period. This difference is statistically significant at the p = 0.009 level. The results of this study indicate that long-term use of NRT is feasible and effective for sustained tobacco-free success and may be an important strategy for reducing health risks due to tobacco use in this special population. Nicotine-replacement therapy is effective for smoking cessation outside pregnancy and its use is widely recommended during pregnancy. We investigated the efficacy and safety of nicotine patches during pregnancy.
                We recruited participants from seven hospitals in England who were 16 to 50 years of age with pregnancies of 12 to 24 weeks' gestation and who smoked five or more cigarettes per day. Participants received behavioral cessation support and were randomly assigned to 8 weeks of treatment with active nicotine patches (15 mg per 16 hours) or matched placebo patches. The primary outcome was abstinence from the date of smoking cessation until delivery, as validated by measurement of exhaled carbon monoxide or salivary cotinine. Safety was assessed by monitoring for adverse pregnancy and birth outcomes.
                Of 1050 participants, 521 were randomly assigned to nicotine-replacement therapy and 529 to placebo. There was no significant difference in the rate of abstinence from the quit date until delivery between the nicotine-replacement and placebo groups (9.4% and 7.6%, respectively; unadjusted odds ratio with nicotine-replacement therapy, 1.26; 95% confidence interval, 0.82 to 1.96), although the rate was higher at 1 month in the nicotine-replacement group than in the placebo group (21.3% vs. 11.7%). Compliance was low; only 7.2% of women assigned to nicotine-replacement therapy and 2.8% assigned to placebo used patches for more than 1 month. Rates of adverse pregnancy and birth outcomes were similar in the two groups.
                Adding a nicotine patch (15 mg per 16 hours) to behavioral cessation support for women who smoked during pregnancy did not significantly increase the rate of abstinence from smoking until delivery or the risk of adverse pregnancy or birth outcomes. However, low compliance rates substantially limited the assessment of safety. (Funded by the National Institute for Health Research Health Technology Assessment Programme; Current Controlled Trials number, ISRCTN07249128.). The objective of this study was to examine whether there is a benefit of adding bupropion SR to high-dose combination nicotine replacement therapy (NRT) and weekly group cognitive behavioral therapy (CBT) for smoking reduction or cessation in schizophrenia. Fifty-one adult smokers with schizophrenia were randomly assigned to a 12-week trial of bupropion SR 300 mg/d or placebo added to transdermal nicotine patch, nicotine polacrilex gum, and CBT. The treatment goal was smoking cessation. The primary outcome measure was biochemically confirmed 7-day point-prevalence of 50% to 100% smoking reduction at week 12. Secondary outcomes were biochemically confirmed tobacco abstinence and change from baseline in expired air carbon monoxide (CO) and psychiatric symptoms. Subjects on bupropion + NRT had a greater rate of 50% to 100% smoking reduction at weeks 12 (60% vs. 31%; P = 0.036) and 24, a lower expired air CO in the treatment and follow-up periods, (F = 13.8; P < 0.001) and a greater continuous abstinence rate at week 8, before NRT taper, (52% vs. 19%; P = 0.014). However, relapse rates in subjects on bupropion + dual NRT were 31% during NRT taper (weeks 8-12) and 77% at the 12-month follow-up. Abstinence rates did not differ by treatment group at weeks 12 (36% vs. 19%), 24 (20% vs. 8%), or 52 (12% vs. 8%). Because abstinence rates were high during treatment with combination pharmacotherapy and relapse rates were very high during taper and after discontinuation of treatment, study of longer term treatment with combination pharmacotherapy and CBT for sustained abstinence is warranted in those who attain initial abstinence with this intervention. Little direct evidence exists on the relative efficacies of different smoking cessation pharmacotherapies, yet such evidence is needed to make informed decisions about their clinical use.
                To assess the relative efficacies of 5 smoking cessation pharmacotherapy interventions using placebo-controlled, head-to-head comparisons.
                A randomized, double-blind, placebo-controlled clinical trial.
                Two urban research sites.
                One thousand five hundred four adults who smoked at least 10 cigarettes per day during the past 6 months and reported being motivated to quit smoking. Participants were excluded if they reported using any form of tobacco other than cigarettes; current use of bupropion; having a current psychosis or schizophrenia diagnosis; or having medical contraindications for any of the study medications.
                Participants were randomized to 1 of 6 treatment conditions: nicotine lozenge, nicotine patch, sustained-release bupropion, nicotine patch plus nicotine lozenge, bupropion plus nicotine lozenge, or placebo. In addition, all participants received 6 individual counseling sessions.
                Biochemically confirmed 7-day point-prevalence abstinence assessed at 1 week after the quit date (postquit), end of treatment (8 weeks postquit), and 6 months postquit. Other outcomes were initial cessation, number of days to lapse, number of days to relapse, and latency to relapse after the first lapse.
                All pharmacotherapies differed from placebo when examined without protection for multiple comparisons (odds ratios, 1.63-2.34). With such protection, only the nicotine patch plus nicotine lozenge (odds ratio, 2.34, P < .001) produced significantly higher abstinence rates at 6-month postquit than did placebo.
                While the nicotine lozenge, bupropion, and bupropion plus lozenge produced effects that were comparable with those reported in previous research, the nicotine patch plus lozenge produced the greatest benefit relative to placebo for smoking cessation. Laboratory trials have demonstrated the efficacy of nicotine replacement in smoking cessation but absolute success rates are low. For many, nicotine gum is hard to use and transdermal nicotine is slow-acting and passive. A new, faster-acting nicotine nasal spray (NNS) can provide easily self-administered relief from cigarette withdrawal. The NNS was tested for safety and efficacy in smoking cessation. Two hundred and fifty-five smokers were randomized to NNS or a piperine placebo. Drug use was limited to 8-32 doses/day for 6 months. Subjects were tested while smoking and at post-cessation daily (week 1) with follow-up at weeks 2, 3, 6 and at 3 months, 6 months and 1 year. Continuous abstinence analyses (CO < or = 8 ppm; no slips) showed that NNS significantly enhanced success rates over placebo overall (p < 0.001) and at all test intervals. Differences at key intervals between active and placebo were: 63% vs. 40% (day 5), 51% vs. 30% (week 3), 43% vs. 20% (6 weeks), 34% vs. 13% (3 months), 25% vs. 10% (6 months) and 18% vs. 8% (1 year). Side effects were common but tolerable. Cotinine measures showed that replacement of nicotine approximated 30% of smoking levels. Hazard functions revealed relapse risks peaked at day 1, day 5 and 3 weeks for strict abstinence. It is concluded NNS is safe, efficacious and a viable alternative treatment for smoking cessation. To examine the barriers encountered by pregnant women who attempt to stop smoking by highlighting three women who used nicotine patches.
                A randomised-controlled trial of nicotine-replacement therapy (NRT) in the form of patches to test its acceptability for pregnant women. Ethics approval was granted despite NRT being contraindicated in Australia for pregnant women and having a low safety rating (category D) (Australian Drug Evaluation Committee, 1999). Salivary cotinine levels were used to assess nicotine exposure and provide some indicator of NRT safety. All participants were given pregnancy-specific cessation counselling, and the 20 women in the treatment arm were offered nicotine patches (15 mg/16 hr), with the option of weaning to lower strength patches if desired.
                The Women's and Children's Hospital, Adelaide, a public tertiary teaching hospital in South Australia, with almost 4000 births annually.
                40 'high-risk' pregnant smokers who expressed interest in stopping smoking.
                As has been found in the general population, 'quit' rates with NRT use were low. Only three of the participants in this study, who became abstinent with patch use during pregnancy, were still abstinent at birth. The circumstances of two of these women, and a third woman who used patches to 'control' her smoking despite researcher advice, are detailed here. Only one of the two women 'abstinent at delivery' was still abstinent 3 months after birth, the last contact point of the study.
                Although health providers intuitively regard pregnancy as an appropriate time for women to stop smoking, the stressors during pregnancy seem to militate against cessation. This study does not indicate that use of NRT will provide an easier solution. It may be more fruitful to institute a concerted lifestyle approach with both the woman and her partner (or significant household members), and continue this support and education postnatally if cessation has not been achieved. Health professionals should also support better-targeted public health campaigns and tobacco-control initiatives generally, because, undoubtedly, the social environment is a major determinant of initiation and continuation of smoking. Does the provision of a nurse-based intervention lead to smoking cessation in hospital patients?
                At tertiary teaching hospital in Newcastle, Australia, 4,779 eligible (aged 18-80, admitted for at least 24 hours, and able to provide informed consent) and consenting (73.4%) in-patients were recruited into a larger cross-sectional survey. 1,422 (29.7%) smokers (in the last 12 months) were randomly assigned to control (n = 711) or intervention group (n = 711). The brief nurse-delivered intervention incorporated: tailored information, assessment of withdrawal, offer of nicotine replacement therapy, booklets, and a discharge letter. Self-reported cessation at 12 months was validated with CO and salivary cotinine.
                There were no significant differences between groups in self-reported abstinence at three or 12 months post intervention, based on an intention to treat analysis. At three months, self-reported abstinence was 27.3% (I) and 27.5% (C); at 12 months was 18.5% (I) and 20.6% (C). There were no differences in validation of self-report between intervention and control groups at 12 months.
                This brief nurse-provided in-patient intervention did not significantly increase the smoking cessation rates compared with the control group at either three or 12-month follow-up.
                A systematic total quality improvement model of accountable outcome-focused treatment, incorporating assertive physician-led pharmacotherapy, routine assessment and recording of nicotine dependence (ICD 10 coding), in- and outpatient services and engagement from multidisciplinary teams of health professionals may be required to improve treatment modalities for this chronic addictive disorder. A nicotine mouth spray has advantages over other acute forms of nicotine replacement therapy, such as a faster uptake of nicotine and faster relief of craving. This multicentre, randomised (2:1), double-blind, placebo-controlled efficacy and safety study evaluated self-reported, carbon monoxide-verified continuous abstinence from smoking from week 2 until weeks 6, 24, and 52 in 479 smokers (≥ 1 cigarette per day) who were treated with either active (n=318) or placebo (n=161) spray for 12 weeks and low-intensity counselling at three smoking cessation clinics in Denmark and Germany. Active treatment yielded significantly higher continuous abstinence rates than placebo from week 2 until week 6 (26.1% versus 16.1%; relative success rate (RR) 1.62, 95% CI 1.09-2.41), week 24 (15.7% versus 6.8%; RR 2.30, 95% CI 1.23-4.30), and week 52 (13.8% versus 5.6%; RR 2.48, 95% CI 1.24-4.94). Most adverse events were mild to moderate, and 9.1% of subjects on active spray withdrew due to adverse events, compared to 7.5% on placebo. The overall rate of treatment-related adverse events was 87.4% with active spray versus 71.4% with placebo spray. Nicotine mouth spray delivered significantly higher 6-, 24- and 52-week continuous abstinence rates than placebo.
There is currently no evidence that nicotine vaccines enhance long-term smoking cessation. Rates of serious adverse events recorded in the two trials with full data available were low, and the majority of adverse events reported were at mild to moderate levels. The evidence available suggests nicotine vaccines do not induce compensatory smoking or affect withdrawal symptoms. No nicotine vaccines are currently licensed for use in any country but a number are under development.
Further trials of nicotine vaccines are needed, comparing vaccines with placebo for smoking cessation. Further trials are also needed to explore the potential of nicotine vaccines to prevent relapse. Results from past, current and future research should be reported in full. Adverse events and serious adverse events should continue to be carefully monitored and thoroughly reported.