And that’s the whole point, isn’t it? ?

This argument has in fact been made but is an open door to intrusive gov actions. They could easily argue that being overweight is their business–as they do in Japan.

“it is none of the state’s business if people smoke.“

That is a perfectly reasonable point of view. There is a perfectly reasonable opposite point of view.

The opposite view arises because the states shoulder a significant share of Medicaid cost. That gives them a strong financial interest to attempt changing private, individual behaviors that are linked to medical expense. Smoking is one of those behaviors.

The federal government also has an enormous financial incentive to attempt changing change behaviors. The federal incentive arises from their financial commitment Its share if Medicaid, plus all of Medicare, plus VA, Tricare, Bureau of Indian Affairs, Federal Employees’ Health Benefits Plan, and others.

One effect of Medicare for All would increase federal medical care cost, leading to expanding federal attempts to butt into private behavior. The federales and the states will continue to argue that their interventions are intended to improve the public health, and can be expected to continue to impose their view on the country.