Isolation is a big one. The classic study people bring up is the “cocaine rat”.
The rat in isolation was drawn to the bottle with cocaine water. When the rat was in a cage with activites and other rats, lost the preference for the cocaine water.
The rat in isolation was drawn to the bottle with cocaine water. When the rat was in a cage with activites and other rats, lost the preference for the cocaine water.
Doing drugs in isolation is a coping mechanism, doing drugs with others is social bonding