No it doesn't. Isn't it possible they use different arguments?
They must, since it is a fact that teens use legal alcohol 2:1 over illegal marijuana.
Isn't it possible they use different arguments?
Sure---but you now have to complicate your theory to account for the facts, and thereby make it less Occam-compliant.
They must
Wrong---it is not proven that teen preference for alcohol over pot has anything to do with legality.