Bit hard to work out what the legal position is. But anyway here's some info on cannabis and cognition. Many pages but page 15 cuts to the chase.
"However, evidence exists of significant harm for some individuals "
I never argued that there couldn't be *some* harm to *some* individuals.
There is a reason why those under the age of 19 are not allowed to buy cannabis in Canada.
I understand your position but this doesn't change the fact that the choice to legalize wasn't taken lightly in my country. They looked at the current research on cannabis before making the decision to legalize and decided that it wasn't compelling enough to not legalize.
We seem be going around and around with this.