I'm not sure you can say one behaves one way and the other not, surely depends on lots of variables.
As an anecdote, I'm literally sitting with a lit cigarette in my hand right now, and the little smoke that comes from the cigarette itself, goes straight up.
As an anecdote, I'm literally sitting with a lit cigarette in my hand right now, and the little smoke that comes from the cigarette itself, goes straight up.