Remember seeing this vid of the three year old smoking...?
http://www.videosift.com/video/Three-Year-Old-Smoking-A-Cigarette

Well, that's nothing..., This mom filmed her 5 year old smoking a joint.
http://www.liveleak.com/view?i=e76_1184712307

I don't know how to get vids from LiveLeak..., so here it is.