If so, what drives the behaviour?
I would be happy to spend my life with only with one drug, Hul Gil- the Joy plant. It would be a short but happy life. Of course, that is not an option.
This human does, it seems to true for a lot of humans. I used different drugs at different times in the 70's and 80's. I settled in on pot and a little alcohol, 3 or 4 drinks a week. I saw a nature film about a watering hole somewhere in Africa where some kind fruit tree drops its fruit which ferments on the ground. All these animals from monkeys to elephants and other species get together and get drunk on there asses. It is realy funny. Evidently we are not alone in this.