Per [0] risk factors for dementia are "lower levels of education, high blood pressure, hearing impairment, smoking, obesity, depression, physical inactivity, diabetes, and low social contact."

A recreational stimulant often taking in social settings seems to hit a lot of those.

The interesting one is blood pressure. Caffeine would spike it, but I have long wondered if "exercising" the vasculature with transients is a good idea and long-term elevation is the real killer. Like school fire drills.

[0]: https://en.wikipedia.org/wiki/Dementia