i think he's saying when he was younger alot of people used to tease him about the fact he smoked pot right.
he then starts saying how now they all are starting to smoke to.
he also goes into a story where one of the people who teased him now smoked offered him some Really bad pot (low potency or something depends what you call bad) and then he gives them a hit of the good stuff and there off there head.
hope that makes it easier to understand lol

Oh and i'm at the Stage where no one knows i smoke cept people i'm close to or reasonably close to :P