Just because the debate is over, doesn't mean people will stop doing it. People do things they know to be harmful every day, from drinking high-sugar soda to eating large amounts of red meat. It's just people.
Replace with anything you fancy, then. The point still stands. People do bad stuff to themselves fully aware of the consequences.
Like eating too many, too few, or just the right amount of eggs high in good cholesterol, bad cholesterol, or just the right amount of morally ambiguous cholesterol.