Dispersion

All of this is a hypothetical situation that I've been wondering about for a while..

Suppose I live in an apartment complex and smoke some marijuana during the night. (Say 9 p.m. or later.) Now I smoke in the bedroom which is a good ways from the entrance to the apartment unit. I also burn incense and use a muffler to kill the smell. So any odd scent would be confined to the bedroom.

Now, the question lies around what happens if on the off chance someone smells the marijuana and calls the police.

If they call the police and the police come, what can they do? It would be night time, so I'm unsure as to if they'd have the audacity to go knocking on peoples' doors. If they did knock on my door, what's the scenario then? I assume if there are no lights on or movement inside they have no choice but to walk away, but if there were lights on and/or movement? I imagine it would be sort of suspicious to just ignore the door when the police arrive, but does it make any difference?

Likewise I wonder about the same situation in the afternoon when people wouldn't normally be sleeping, and the police would be more likely to knock.

Any info would be appreciated.