I got it!

What if everyone had a bottomless healing potion in their inventory at all times, so they never ran out of healing?

Only, instead of a magical potion, maybe it could be something else, like maybe a cigarette?

An ever-burning cigarette that can be used as a bonus action to heal up all your scrapes and burns.

I mean, I don't see the harm. If you don't wanna use it, don't use it.