I absolutely can't stand it, the smell is killing my nose, I usually try to keep distance to such people.
Sadly, my neighbour is a smoker. When I open my window, there is a high chance I'm going to smell that instead of "fresh" air (can't even really talk about fresh air in this city, nothing compared to mountains in Austria for example, every breath here tickles in the nose
)... I have been raging a lot whenever that smell got into my room through the window because then I have a hard time getting rid of it.
Luckily, the temperatures are cold right now, so I don't feel the need to have an open window and even if I open it, my neighbour doesn't feel the need to smoke in the cold. 
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Diagnosed with Aspergers.
BSP-errors are awesome.