"I smoked a pack a day for six months five years ago" They can't make you prove that, how even would you? (though that may wind up in your medical record and come up again down the road, but at least you'll be vaxxed and alive to have that conversation)

and at that point I would just say "I lied so I could get life saving treatment" if a dr gives me shit for that I want another dr

Good point, and yeah, that wouldn't be a doctor I'd want to have