I'll bet you did the weed first.
I've known a lot of smokers over the years, many that started in junior high school. A rough breakdown after, say, the end of college (roughly a 10-year span of time)-
60% quit totally
20% smoke less than they used to
10% smoke more
5% switched to alcohol as a drug of choice
5% went on to other, "harder" drugs
Of course, availability determines to a large extent what you get into - the kids in the inner-city have easier access now to crack than weed, so that's what they use. True, they might have started with a joint, like so many kids smoke their first (nicotine) cigarette. But the connection between doing a doobie and becoming a trashed-out heroin fiend just doesn't exist in the real world, except as coincidence.