One of my best friends is now strongly using cocaine. He has enough money so he can afford it, but he is doing automatically every friday and saturday.
He works and lives a normal life, is a manager in an international company, spends his evenings during working days with his girlfriend at home watching TV etc, but comes weekend and he puts 3-4 grams of that stuff combined with 7-8 bottles of wine.
Is it just a part-time junkie? You think he can stop it? I think not.
Have my own experiences with drugs and I think he is completely in it now.