How do I make him stop?, Drugs Options

[HiFemaleSeanFeng]

So my boyfriend is in IB and what IB is is it's this stupid academic program that provides you with the hardest classes and because he's so stressed out, he keeps talking about getting high and what not. It's pissing me off. Like, I really wish I didn't have to worry about shit like this. I tell him to stop making these drug references but he ends up just getting pissed off at me. And knowing the person he is, he probably is going to get some from his stupid friends and get high when I don't know it. I don't want him to mess up his life, considering that his grades are dropping and he just doesn't care about anything anymore. I don't want to keep worrying that he'll drop and go randomly have sex with another girl that's dropping right next to him.