If this is the kind of thing where smoking shaves 8 years off your life and you die at 67 instead of 75 it could be a net benefit to society because you aren’t

If this is the kind of thing where smoking shaves 8 years off your life and you die at 67 instead of 75 it could be a net benefit to society because you aren’t collecting any social security. I’d be interested in what the leading cause of preventable death is for people under retirement age. Otherwise, is there any reason to force people to live as long as possible?