There's one MAJOR difference between those who smoke cigarettes, and those that smoke weed, besides the fact that weed actually GIVES you something back.
The other difference is that a smoker smokes a LOT more than a couple of cigarettes a day. Im someone who has a joint, or a hit from a bowl, and then I'm all cool for the day. Can you imagine smoking what a chain smoker smokes? Like 20 joints a day! Now that would probably be enough for a smokers voice. But thats not your standard stoner right there..
(Drifting here, and really not much to do with the topic, but made me think of it, but one of the one peices of advice my older brother gave me that I have really cherished, was when he turned, Malboro in mouth, and said to me "Seb", promise me if you ever smoke anything, it will only be cannabis, because at least thats a plant that GIVES BACK to the smoker. This right here *points to the cigarette*, this takes me down, and brings me back up to normal. And it costs a BUNCH to get it back to normal.")
Amen to that.