For me it kinda depends on the situation. When there are this girls just standing outside a shoes or clothing shop, smoking only to kill time, looking bored and annoyed and clearly not wanting "to do this, like, stupid job", I wouldn't go in. But if it's some small cafe or garage-sized shop on a slow day, I think it's perfectly OK for one to sit outside and enjoy the weather, until some customer comes along. Hell, I've done that (smoking excluded, of course). Because sitting behind a bar for hours with nothing to do or no one to talk to can be a bit boring.