What is this? Your version of the Second Amendment?
"Access to health care rarely leads to better health outcomes."
Access to health care affords patients medical treatment and access to health care professionals who guide/educate patients on how to take better care of themselves.
Plenty of people who have healthy lifestyles, not just fat ass smokers, are diagnosed with serious illnesses everyday.
If these people don't have access to adequate medical treatment their chances of a successful recovery significantly diminishes.
Rarely is a strong word but OP has a point. If you smoke 3 packs a day and go to the doctor he can prescribe drugs and even get you an oxygen tank but the inherent problem is the 3 packs a day. Same thing if your eating a case of twinkles a day. I think this is what OP is highlighting. I would not argue that having access and going to a dr and adhering to his/her advice allows for great advances but it is not a silver bullet.