I feel like I caused my best friend's drug obsession. Now he won't stop.
How would you say you caused your friend's drug addiction?
I told him how much fun I had using and he wanted to try too. It just went out of control from there.
I get that it was something you enjoyed doing but you already know using drugs is bad, otherwise you wouldn't be concerned about your friends addiction. You being the person who introduced them to him are responsible for his addiction and you shouldn't have done that. I only hope you're able to help him beat it and support him through the proccess.
If a rape victim shares an experience with someone and the person gets raped, the victim has a responsibility for it?
That is not the same! your friend looked for drugs because you promoted them not because of sharing your bad experiences with them.