I usually don't even worry about whether someone will see me or not. So I'll smoke just standing next to my vehicle. Either that or right outside the doors of wherever I'm at. People have noticed, yet nothing ever happens. Stupidly enough, we were doing it in a hotel hallway once. (it was fricken cold out and someone just busted it out right there) The security just told us to go outside if we are going to do that.

Where I live I'm trying to get people to be more lax with it. So I'll intentionally start a smoke session in a public area. Only with joints though. That way it's easily disposable if needed.