<qa>  How many girls will be recruited for Phase II?- For Phase I of the study, we will recruit adolescent girls who report smoking at least 5 cigarettes per day for 6 months. We will recruit approximately 40 girls to participate in one of 4 focus groups. For Phase II, we will recruit adolescent female smokers n 40 aged 13-19. Potential participants for Phase II must smoke at least 5 cigarettes per day and be sedentary i.e., participating in physical activity two days per week or less for 30 minutes or less each day. Other specific eligibility requirements for both phases include: a having no physical or mental limitations that would restrict their ability to be active or complete study measures; b passing the Physical Activity Readiness Questionnaire PAR-Q. 