George,
I had a brief fling with Mr. Cocaine in my early thirties. There is nothing glamorous about him.
You end with a couple of users, doing lines and trying to find the thrill again. You sit around gnashing your teeth and desparately trying to find something to talk about but you are all talked out. Time to drink to come down. Then time for lines to get up. Yada yada blah blah. And so it goes.
So, treading lightly here, yes your friends are cocaine users/abusers. I don't think that's news to you. Walk away now.