As far as smoke being harmful, the article points out the differences between pot and tobacco, and how
pot doesn't have the same effect that tobacco has, and how
many joints you'd have to smoke in
order to get the same damaging effects that tobacco causes. There's just no comparison, and you'd have to smoke like all day long just to try to kill yourself off the way tobacco does with far less effort.
Kudos to you Berlyn, you really made my day with that post.