I'm pretty sure we'd all agree that common courtesy and respect for promoting the shop's business should guide how we behave when dropping in. When I visit a shop I don't know, I make a point to buy a couple of ounces of a new blend before I even think of lighting a bowl. Sometimes I ask if I can fill a bowl and light it after it's weighed out (so that I can pay before smoking it). I can't remember a time when I wasn't invited to sample a bowl on the house. When I drop in at a local shop, where I'm a regular customer, I usually need to buy tobacco. When I have the time to hang out and smoke, no need to ask if it's okay. One of the shop owners tells me he's glad to have his regulars drop in to smoke because he likes it when the sales floor looks populated - he says it makes the place look friendly and attracts passers-by. He usually doesn't need to remind regulars to look after themselves when he and his staff need to help other customers. When the place is busy, I get out of the way of the sales action - and I don't overstay my welcome.