If I find people smoking in no smoking areas, how can I report the case to the Tobacco and Alcohol Control Office?

As smoking is an action that lasts for a very short while it is impracticable for inspectors to provide assistance on spot immediately upon receipt of complaint.  You may make a complaint to the venue manager of the premises and request them to take necessary tobacco control actions. 

If the smoking offence persists, you may report to the Tobacco and Alcohol Control Office (Tel: 2961 8823 / Fax: 2575 8944 / Email: taco@dh.gov.hk / tobaccocontrol@dh.gov.hk ).