The state should ban or tax unhealthy substances (like drugs, alcohol and greasy food)
Some substances are clearly harmful for health like drugs, alcohol, tobacco, greasy food and sweets, yet people continue to abuse them. Therefore the state should outright ban the most harmful ones. When the damage is not big enough to justify complete ban or it is otherwise impractical, they should be regulated and taxed heavily. Not only does this curb consumption, it also provides funds for treating the problems they cause.