Someone was smoking out of the window in the room below me. I smelt it at night, and again in the morning. I looked out, saw the cigarette, and asked him to stop because I could smell it. He looked out, mumbled something, and stopped. He was covered in tattoos. The problem hasn't recurred, but he might only have been a visitor.

This is a non-smoking building. I'm on the fifth floor (0-based in England), so I'm only ever aware of smokers outside the building occasionally when I leave and come back.

All I can suggest is to make sure you go for a non-smoking building when you choose a flat.

Personally, I hate it when people smoke. There are no two ways about it: it's a very antisocial thing to do. If I were to leave the house naked, I'd probably get arrested. But at least you could look away if you passed me. You can't 'look away' from a cigarette. If you're going to smoke, the very least you can do is make sure you aren't affecting anyone around you.

If your country/situation is leaving you with no options as to where you can smoke, then damn well give up the habit. I can understand when people get a craving on entering a smoky pub or whatever, but if you're never around another smoker, give up for god's sake.