You know what, this is a great hypothesis!

You're definitely right about amphetamines being bad for you, I'm sure I read articles about consequential heart failure because of amphetamines, and when I was in Vietnam vices were exactly as you say, I almost never saw a woman smoking, but all of the men smoked and drank energy drinks!

Like multiple a day, while they were driving or exercising in the square, delivering packages, everywhere.

I'll go look back at my original reply and get those articles to you.