Uh... your *neighbors* are smoking and this is stinking up your apartment? Maybe a candle will take care of it, hopefully, otherwise there may be little hope. I'm grateful to mostly not be able to *hear* what's going on next door, let alone smell it.
Short of that... maybe consider taking up smoking and then it won't bother you nearly so much. :-)
Neighbors = people in the apartment right below me. They're out on their balcony, smoking; I've got my balcony door open; the smoke drifts right in. I swear, this isn't one of those "He's sealed in his house, a hundred feet away, and his secondhand smoke is killing me!" deals.
They're also kinda noisy. What'm I going to do, though, they could get a lot worse.