Well, actually, thanks to ObamaCare, it kinda is my business.
She is going to eventually want “us” to pay for her new hips and knees; it’s most assuredly our business.
Sadly, a great many people will agree with you.
I say “sadly”, because a profound loss of personal liberties is one of the consequences of socialized medicine. Everyone engages in some “risky” behaviours — play hockey, ski, ride a bicycle, ride a motorbike, go camping, have a drink after work, walk to work, drive to work, etc. If you judge other’s risky behaviours, purely on the basis of the cost to the medical system; then you can expect your risky behaviours to be judged the same way. And you might not like the results.