Smoking Cessation: At one week follow-up 13 of the 19 participants (68%) claimed to have stopped smoking and not had a puff during the previous week. Of the other six participants, two managed three days without a cigarette, one managed two days and three were not able to abstain for one day.
These three participants who were unable to quit for even a day were particularly heavy smokers, averaging 38 cigarettes per day, and having an average expired carbon-monoxide concentration of 38 parts per million.
At one month follow-up, nine participants (47%) claimed to be abstinent. However, only five of these (26%) attended a follow-up and validated their abstinence by providing an expired carbon monoxide measurement of less than 10 ppm (average = 5ppm). One attended and had two separate measurements above 10 ppm (one as high as 39). Two (a husband and wife pair) claimed to be abstinent on the telephone but failed to attend three separate validation appointments. One other participant couldn't attend due to pressure of work. The true one-month success rate therefore lies somewhere between the validated rate (26%) and the self-reported rate (47%). One participant claimed to be abstinent on the phone but when she attended had an expired carbon monoxide level of 26 ppm and admitted that she has been smoking, but did not want her friend to know.
At 3 month follow-up 6 participants (32%) claimed to be abstinent. 5 of these (26%) claimed to have been abstinent from their first appointment, and one had lapsed, but managed to abstain again after a booster session.
An attempt was made to follow-up these 6 participants again approximately 8 months after their quit date. Two confirmed that they had returned to smoking, two confirmed that they continued to be abstinent and three were consistently unavailable and a family member who answered the phone volunteered that they thought they were still abstinent. This suggests long term (unvalidated) abstinence rate of around 26%.
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