In most countries, it's not clear if smokers use more health care than average. They do get sick more, but they also die sooner and more quickly. But let's assu

In most countries, it's not clear if smokers use more health care than average. They do get sick more, but they also die sooner and more quickly. But let's assume it's true, and that smokers do cause an undue burden on the health care system, and therefore smoking should be banned. Why not apply the same argument to obesity? Obese people definitely cause an undue burden on the health care system. Why not tax them more, or force them to diet and exercise? It would be very cost-effective, allowing taxes to be used for more productive things. And as you said, individual freedoms are always constrained in various ways for the good of society. I don't see this as much different.