Hello all, so I've had this friend since high-school, we had mutual friends but we only really met when we started working the same job together, we bonded by work and smoking together. Fast forward a bit and he got a little deep into the drugs, his was mostly coke. I assume he had a problem with it considering he would use it right before work in the mornings and sometimes I would see him rip a line that was two hand lengths. He even got to a point where he tried crack once.

That was almost 2 years ago, he took a break and he knew he was about to have a problem, but fast forward to now and he's at it again. I've always been very worried for him as he's my friend and I can't see him go into a downward spiral like thqt again. I want to say something but Ive had conversations with him before about it those 2 years ago and then he was very attached to the idea that he has it under control and knows his limits, even told me that he does it out of emotional pain (don't we all at some point), and I know its hard for some people to move past things but I feel like I have some duty to pull him out of it but another side of me is saying to let it go as I really have no control over the situation. Thoughts?