The loop works like this: you start drinking, you get drunk, too drunk to drink more so you buy cocaine, happily drinking and doing cocaine until the next day.
It goes hand in hand with alcohol and if you're developing a problem with booze it's easy to continue with cocaine.
Agree with this sentiment. I have a super addictive personality but the diminishing returns are so extreme that after an hour or two it's just a waste of time. I've never really understood how people can develop a problem with coke given how expensive it is.