Hello. My DS is 18, over the last few weeks leading up to Christmas I've noticed a change in him which came to a head when he presented slurring blurred eyes and dopey. I believe he is vaping THD/ cannabis oil. I'm quite a liberal soul and appreciate and understand (some of) teenagers behaviours and need to experiment. My worry is he is doing it quite a bit I suspect at home alone. I get when someone rolls Joint they may have a few puffs and it's done but this oil is a strong chemical. I've reached out to him in an attempt to talk and wrote him a letter with my worries but he doesn't want to talk about it. He's just secured a new full time job and has a lovely gf but I'm at a loss.