If smoking were contagious with an R-factor of 3-6, overflowing hospitals and ICUs, and could be cured by two shots a year, it might not be a bad idea.

A better example, actually, is someone refusing free treatment for lung cancer at stage 1, because they believe that cancer isn't real and Big Onco is trying to kill them, and then barging into the hospital, and demanding treatment when they hit stage 3. I'd have very little sympathy for that person.