You're saying that if everyone in the world started to take cocaine daily, a high percentage of people, say 80-90% can handle it.

What does handling it mean if you're taking cocaine daily? Taking drugs daily is already likely beyond the point of dependence. Regardless of will power, you will almost certainly develop some level of chemical addiction and tolerance trying to use cocaine, recreational-y, daily. I would say the question is invalid.

I meant most people can do cocaine once, or at an infrequent irregular frequency without getting addicted to it and becoming dependent.

FWIW most means > 50%

This is debatable. If there is a critical mass of people doing cocaine regularly, then more people will get addicted with that availability.

Higher than that I would guess. Bolivians seem to handle it at a rate of "all of them".

Of course they're using quids, if they were injectors of pure cocaine the situation would be less rosy. But you didn't specify the route and concentration.

This isn't a gotcha, it's a habit of daily use by millions, all of whom are basically fine.

Wrong way around. If everyone in the world consumes something and side effects are very rare and usually mild, then you have to argue what the problem is.

For cocaine and most "hard drugs" probably neither is true. For coffee it seems both are true. For alcohol 1 is true and 2 is tricky.

the poison is in the dose