Mobile EMA-based Peer Counselling for Youth Smokers

Subjects will be asked to complete 3 waves of ecological momentary assessment (EMA) about smoking cues and smoking consumption via mobile phone at the first, second and third month after baseline (total 6 weeks)

Subjects will receive tailored peer counselling based on the participants' EMA responses at 1-month and 3-month telephone follow-ups.

Subjects will receive peer counselling through telephone during follow-ups (usual care), in which the counsellor will apply the 5As model and motivational interviewing techniques.