Advice on how to deal with this situation please.

[Sleep10]

My son has many friends.. He is asd and adhd but a very popular boy. Everyone accepts him the way he is, which is fantastic.
He has his ways/ traits that are ok but have an impact on some situations.
He doesn't see danger / doesn't see the consequences, very much black or white thinking (as in the saying).
Some the people he hangs out with, at times, smoke weed. He's wanting to spend more time with them and stay over at houses, which I'm really not comfortable with.
He was excluded from school as even though he was found with nothing on him, he was in a group who smelled of this, 2 of 5 were found within their possessions. All had the same consequences, welcomed, and he had consequences at home. This was a few months ago, but they've become close again.
I've said no this weekend, but apart from saying no and the obvious conversations we've had with him. How do i go forward with it as he's 15 and wants to be out with them? He can only go out if I drop him off as we live rually, though.

My daughter had same situation at 15. I didnt handle it well, I regret not beeing more strict.
If you give in it will only get worse...drinking and vaping. And to the point that he will think its " normal".
I really really do regret no beeing more strict. I taught its a short phase that will go- that's what m friends told me and advised.
My daughters friends were good students, good homes but they all got into trying too much of weed, alcohol, vapes, thc vapes. It's dangerous, as some kids get hooked. And beeing on spectrum- like my daughter too, also social and popular - they get more into it as it eases their anxiety.
So its not just a trial for kids on spectrum, they get really into it and love the feel it gives them, as finally they found a way to feel less anxious.
Very very dangerous for them.
I wish knew all that before. Now my daughter (17) vapes, and I buy her no nicotine good ones, as she got used to dealing with stressful situations vaping.
I am really ashamed that it got to that point that i buy it so at least she has good quality ones, no nicotine - not the cheap harmful stuff.
I hope at least my mistake help someone not to do the same

Hi, thanks for your view on what you've experienced.
My son, too, got into vaping. Every time I found one, I'd bin it and take his phone / xbox for the week as well as grounded him.
In the middle of all that, someone he knew off gave him a vape that was laced. I got an sos call from him. Found him in the park, we had to stay by his bedside for 12 hours
We don't have that issue now.
It's harder with him with how he is. I have older children than him and younger. I definitely needed other advice to see if there was anything to do that I may be missing.