Halacha requires we do what is best for each of us.
“Real doctors” with “Real” medical training used to smoke and tell us how healthy smoking was.
Before that, in the late 1800’s; “Real doctors” with “real medical training”, promoted the “healthy glow”, from radiation treatments and pills.
And I could tell you absolute horror stories, about what “real doctors” with “real medical training” have done to members of my own family with their absolute unprofessional and uncaring attitudes and incompetence.