I realise about boundaries - and certainly about "me" time. Most definitely both are needed, because, joking apart, it is mentally tiring. But out of it I have a very intelligent friend, who just happens to be a little different, but hey, every one is different.
I have someone to play scrabble with, and if he wipes the floor with me over this once more, there's going to be another stand off!
He hasn't had a drink for months now, but he does have a problem with amphetamines, from time to time, I'm not even going to knock him for that because I feel it is not up to me to dictate to a 38 year old man about things like this. What I have worked out is that if I tell him that this is not something that I am ever going to do, and why (health etc), and that I worry he makes himself ill with it (psychosis) not very long after our little "talk" he makes a very concerted effort not to go and buy it. He has setbacks, but I see he is trying at least and there's a start. Better I think that he works out for himself what is bad for him. We'll get there.
I actually enjoy his company, and when we go walking, I listen to what he is going on about - and despite what he thinks, its not all rubbish - its just a bit muddled and askew.
Glad to have found somewhere nice like this, so I can check I'm getting it right from time to time!