So they want to tax something because it's "probably carcinogenic". Cool, when is the coffee tax coming? When is the fruit and vegetables grown with herbicide tax coming? When is the charcoal tax coming?
The alcohol tax is already here. Sugar tax sounds like a sensible idea.
Problem is we also screw up other people's futures while making personal choices. Somehow I doubt we can expect a meat tax anytime soon in the US.
Here's quick chart on classifications of carcinogens, there's definitely quite a few vague areas
https://www.compoundchem.com/2015/10/26/carcinogens/