[joefourier]

Caffeine is incredibly benign compared to alcohol and nicotine, and so far research has shown that it may actually be a net positive in moderate amounts in terms of cardiovascular health.

If you're worried about gastrointestinal problems, you can switch to tea. Much less acidic and harsh on the stomach, and some varieties have enough l-theanine to counter the negative effects of caffeine. If you're worried about the caffeine content not being concentrated enough, you can even drink matcha, which typically has more caffeine per ml than American filtered coffee.

[toomanybeersies]

Nicotine is also fairly benign, it's tobacco (especially smoking it) that's bad for you.

Chewing nicotine gum or using patches can give you the focus and clarity that smoking or vaping does without filling your lungs with shit.