I did towards the end of my old temp job every now and then, like on Friday's. I didn't do it a lot because I would start to feel burnt out by lunch. I haven't at any other job, though. A good friend once said, "If you go to work stoned, you'll have nothing to look forward to when you get off!" I think there's a little truth in that. I think it makes the smoke more satisfying if you aren't always doing it.