Adventure-based intervention group included 1 day-camp and will be divided into 2 parts: (1) physical activity such as wall climbing, ropes course etc, (2) health education delivering about the relationship of self-efficacy, self-esteem, emotion and smoking abstinence. The training will be held before the 6-month follow-up. Telephone follow-up will be conducted at 1-week, 1-, 3-, 6-, 9-, 12- and 24-month.

For WhatsApp intervention group, not more than 8 subjects with same gender will be assigned into a group. Messages about mood and stress management will be sent to the group per week and the group will last for 6 months. It aims to relieve their pressure and emotion by sharing their unhappy things with other subjects. Telephone follow-up will be conducted at 1-week, 1-, 3-, 6-, 9-, 12- and 24-month.

For the control group, the subjects will receive telephone counseling on quitting smoking at 1-week, 1-, 3-, 6-, 9-, 12- and 24-month.

One-day adventure-based training will be assigned to subjects and the activities include wall climbing, rope course and health talk on mood, pressure management and smoking cessation.

The subjects will be asked whether they have smoked cigarette in the past 7 day at 6-month

Bio-chemical validated quit rate will be conducted if the subjects who reported they have been stop smoking for at least 7 days at 6-month. They will be invited to perform saliva cotinine test (using NicAlert strip) plus exhaled carbon monoxide text to validate the smoking status.