My opinion on weed is that it should be legal, but due to the fact that it can impact a developing brain somewhat badly I would put it behind an age restriction, 25 - 26 years.

Question now is what to do with people who would smoke under that age. I would most likely go with what happens to people where weed is atleast partially decriminalized. A ticket for the first time getting caught, and then bars if it keeps happening. A somewhat strict '3-4 grams on person' rule could be introduced as well, i.e. not telling a person under the legal smoking age anything if they aren't carrying too much.

That's at least my take on it