Irritating To Hve Smoker Neighbour

What can I do to my neighbour who always smoke along e corridor? It is illegal to smoke along hdb corridor to be frank. Generally I am ok w smokers but shldnt they have considerate also. In addition they have kids also. If want smoke either confine themselves to their own house or go downstair smoke. Calling police or making report to town council normally is no use. They wil say talk to them but also afraid they wil take revenge. Haiz... Sickening to hve such neighbour.