What are the "most unhealthy" products, exactly? Where do you set the bar?

You don't have to choose a bar, choose the worst thing first and see if you think it's something you're ok selling. Repeat until content.

Well that's the problem, isn't it?

The bar never stops moving.

Today, it's cigarettes. Tomorrow, it's e-cigarettes. Then it's sugary sodas. Then cookies.

Eventually, the store sells tofu and free-range cotton balls.

Not just that it never stops moving, but that it's arbitrary. What I consider unacceptably unhealthy is entirely different from what you may consider unacceptably unhealthy. My original point was that if we're going to eliminate all the unhealthy things, we might as well just keep going until we're all buying nothing but raw vegetables.