On the training day, the investigators will explain at the beginning of the workshop the purpose of the training, and the details of the brief smoking cessation intervention to all physicians who attend the training workshop. The investigators will explain that the participation is totally voluntary, and the participants will be invited to complete a paper-and-pencil survey before and right after the training workshop, perform smoking cessation counselling or placebo counselling among patients at their clinics, and complete online survey at 6- and 12-month follow-up. Agreement to participate in the training program will be considered as consent and participants are required to sign a written consent form.