and smoking behavior. Participants were asked about the frequency and quantity of cigarette smoking, time since began smoking daily, and time since last cigarette smoked. The number of cigarettes smoked per day was calculated by averaging the number of cigarettes smoked that participants reported for each day of the last week during which they smoked. Nicotine addiction was assessed using both the Modified Fagerström Tolerance Questionnaire (21) (mFTQ) and the Hooked on Nicotine Checklist (22) (HONC) which have been validated for use in adolescent smokers. Participants were also asked to rate how addicted to nicotine they felt using a scale from 0= “not at all addicted” to 100= “extremely addicted.” The Minnesota Nicotine Withdrawal Scale (23) (MNWS) was used to measure subjective withdrawal symptoms at baseline and 24 hours post baseline. Participants were monitored closely in the PCRC during the 24 hours of abstinence. They were provided with a selection of movies, games and books to help reduce boredom. In addition, all participants received a cash incentive for their participation.
