ok so one of my best friends came into town and hungout with me on friday......we had a few ppl over and everyone was drinking and just hanging out....nothin unusual.....well this guy likes to smoke pot alot so he did nothin unusual again i have done it with him a couple of tiimes but no big deal.....well it was just me and him and i could tell lately on the phone and at coldplay the other weekend that he has been really kinda slow and just a little off....so we started talkin and he started tellin me about all the drugs he had been doin....i was blown away...he said that he had been slown down over the last month but there is really no tellin with him.....so me and my roomie both talked to him that night and we both hopeed he listened to us but he always just goes yeah ur right i need to slow down...blah blah blah....but he still does it ....i am really worried about him and dont know what to do........any imput?