this question has been asked so many times man.

look, only you know your parents. ive heard of parents straight up calling the cops on their kids, another dude was like "i told my parents and theyre cool with it and letting me grow!!"

point being, if your mother like mine, will cry and think shes failed raising a potsmoking son then dont tell them, something better kept to yourself.

however if you think your parents would be rational and understand, or maybe smoke themselves, fuck it tell them.

one things for sure, if theyre gona tell you to stop dont tell them. lying to your parents is worse than doing something they dont know about. in my opinion.