Societal level engineering is about adding friction to things which are unhealthy. There's a lot of debate on whether we should do this, but for sure it has lots of examples of working.

QED: If you want to smoke yourself to death, you can. But the government wants to add some friction to that so it's not the default case for smokers. Taxes, awareness campaigns and (god forbid!) putting some limits on what cigarette companies can add to cigarettes.