However, these SMS-based RCTs could not provide real-time responses from the counsellors, which might weaken the smokers' intention to quit and lower the intensity of social support. In the present proposal, we hope to enrich the SMS-based intervention by using social media such as WhatsApp or WeChat etc., which can provide an interactive platform and develop a semi-personalized interactive IM system that can tailor for the smokers according to their characteristics, needs and demand.