Caffeine is long term safe to use, tapering is done easily when its necessary (see my other comment on the thread, I tapered over 10 days with no side effects). And it's a stimulant.

I was happily addicted to it for years and other than a couple withdrawal headaches when my routine got disrupted* the only ill effects was occasional morning crankiness.

I expect I'll become addicted again at some point in the future. Probably in the winter with a nice hot mug on a snowy morning. I'm looking forward to it.

I can't imagine any state or religion banning caffeine. It's the safest, most wonderful drug there is.

*Any restaurant or convenience store could fix my headache for me.