My younger sibling uses substances
I usually don't come on the internet to ask for advice or support, but I'm currently feeling stuck in a difficult position and i have nobody to talk or share this to, so i hope typing this out might help me get some support or relief.
Recently in may my family went through a difficult situation, my younger brother had used a substance which made him collapse in his room. We called up the ambulance and they monitored him for a few hours, ran some tests & sent him home again once the effects wore off. Later at home we had a very difficult and vulnerable conversation about it. For my parents this hit like a bomb, i sort of tried to stay as level-headed and neutral as i could because my brothers safety comes first. Either way, it seemed like my parents just viewed this as a "he made a mistake and learned from it" to cope. They haven't asked or checked up on him at all and even became a bit apathetic. I understand it probably comes from fear and not knowing what to do.
What my parents don't know, is that may wasn't the last time. Since then he has still used various substances, wether it was on festivals (which i can somewhat reason with as it's done for recreational purposes) or by himself (which worries me most). Our rooms are on the same floor so whenever i hear sounds that feel off, i become hyperalert. Recently i came in his room to ask a question, and i could immediately tell he had used something. He was aware but his speech was slurred, his movement was slow & i had to repeat myself often. We later on had a conversation about how I'm just worried and that this is me caring about him. But he keeps telling me that he knows what he's doing, that there isn't a problem and i should trust him. That it makes sense to him and that's what matters. When i ask "why?" he replies there isn't really a reason, that he doesn't use it to cope and that he understands the system & won't give into it. And i do, i want to and try to trust him. But i can't ignore what I've seen, his words don't align with reality, that doesn't mean he lies, but it shows that the promises and reassurance he gives don't match up with the actions. Randomly doing some drugs by yourself, at home is just very uncomfortable.
I don't want to feel pushy, i don't want him to be uncomfortable because we have a very strong bond but I'm very scared to get blindsided. It's been killing me because i have anxiety and i can feel how my body can't let go of this. I just don't like seeing him like this and i want to support or help but he seems to be stuck in it.
What do i do? What should i watch out for? Any advice, any words :( ?