Exactly the opposite is true: of those who have used marijuana, 9% have at some point been dependent - whereas the figure for alcohol is 15%.
The problem is that “light” marijuana use leaves a much more lasting impact on the brain than light or even heavy alcohol use. Especially the adolescent brain.
Very few people become alcohol dependent as teenagers. It usually takes a long, sustained period of use to achieve that state. Pot, on the other hand, is pretty fast, and now that it’s legal, you’re going to see that percentage soar.
Look it up.