How do you stop a smoker from smoking downstairs

[tiong]

talk to him is the best la, it is not wrong to smoke inside his own house.

if he still do that you go buy a packet of marble, drop some in your kitchen when he smoke, and at night do the same things in all your rooms, for many days. Than he will come up to complain to you, when that happen u tell that man you told him not to smoke liao but he still do that so you can also do that, any way it is not wrong also to 'play' with marble inside your own house. 

[H2OSeekers]

I've got a good one. When he smokes, go quickly to his house, press the doorbell and wait. When he opens the door, let out a mega loud and smelly fart. After that thanks him and run.... 

[shells]

hahahaaa.. that's a good one 

[Alaska]

don't forget to cover yr face just in case he recognise you.