You'd be a fool to run after a boy who gets stoned and treats you badly and makes you cry. Use your HEAD NOT YR HORMONES. THINK. THINK. THINK.
Physical attraction is not love or even the same as really LIKING and RESPECTING someone and it's not enough to found a relationship on.
This boy sounds like a loser to be frank and an abuser. If he makes you cry and threatens - even as a joke- to put you in hospital, it's not even REMOTELY funny. He doesn't sound mature or a good candidate for a boyfriend- and I can see why yr mom& friends don't like him.
Your instinct told you to say NO for a REASON when he first asked you out. I hope you're strong and smart enough to do the right thing and forget him. If he makes threats you should take them seriously- even if he seems to be joking. Leave him alone and find someone who doesn't use drugs or get drunk, someone who doesn't mistreat you and make you cry, someone who doesn't threaten things if he doesn't like what you have to say, and someone who will respect you and really care about YOU- not just someone who fancies you and wants to take you to bed. THINK.
Your mom& friends are just watching out for you. If you had a daughter would you really want her to go out with a man like the one you're describing? I hope you don't end up with him as he'd hurt you and you'd regret it. Be strong because the writing is on the wall, as they say, in this case. And it couldn't be clearer.
You should also know that you're worth more than allowing someone to abuse you and make you cry just because he'll do something to make you feel better afterwards. There's no excuse for anyone to mistreat you. EVER. And certainly not someone who claims to like you or care about you. Good luck.