Effectiveness of a nicotine patch in helping people stop smoking: Results of a randomised trial in general practice
Burke P., Chivers A., Clements J., Dawes M., Eastwood I., Ebbs D., Godlee R., Harrington R., Kearley K., MacLennan N., Mant D., Murray J., Nichols M., Van Oss H., Stern D., Stevens R., Thurston D., Wilson R., Wood S.
Objective - To assess the effectiveness of 12 weeks' treatm ent with a 24 hour transdermal nicotine patch in helping heavy smokers to stop smoking; also to assess the value of a specially written support booklet about smoking cessation and patch use compared with a simple advice pamphlet. Design - Double blind placebo controlled randomised trial with a 2 x 2 factorial design. Setting - 19 general practices in Oxfordshire. Subjects - 1686 heavy smokers aged 25-64 (mean cigarette consumption 24/day; mean duration of smoking 25 years). Main outcome measure - Sustained cessation for the last four weeks of the 12 week treatment period, confirmed by saliva cotinine estimation (226/262 cases; 86.3%) or expired carbon monoxide concentration (36/262; 13.7%). Patients lost to follow up (155/1686; 9%) were assumed to have continued to smoke. Results - Cessation was confirmed in 163 patients (19.4%) using the nicotine patch and 99 patients (11.7%) using the placebo patch (difference 7.6% (95% confidence interval 4.2% to 11.1%); p < 0.0001). There was no significant advantage in using the more detailed written support material. The most important adverse effect of the patch was local skin irritation, which occurred in 15.8% (133/842) and 5.1% (43/844) of patients using the nicotine and placebo patches respectively, was graded as severe in 4.8% (40) and 1.1% (nine), and was stated as a reason for withdrawal from the trial in 9.5% (80) and 2.8% (24). Conclusion - Nicotine patches are effective in a general practice setting with nursing support, but the extent to which this effect is sustained cannot be assessed until the results of long term follow up are known.