I've only had one, but it wasn't a smoking dream as much as a cigarette dream...I was surrounded by every brand, mountains of packs, and all I had to do was take whatever I wanted. It was exciting, and sort of scary at the same time. I didn't smoke in my dream, and I haven't had another since.
On the other hand, I recently had to go 100% gluten free (diagnosed w/anti-gluten antibodies, and that my brain reacts to wheat like it's an opiate--a real addict) and have been completely off gluten for a month (I used to have a burger on a bun once a week or so), and had a bread dream last night. It was a terrible dream. I was thoroughly enjoying that slice of crusty, chewy French bread when I realized with one bite left to go that I wasn't supposed to be eating it...trying to decide whether to have that last bite was torture.