They used to have a wax coating, in just the past decade that has disappeared almost entirely and any recently manufactured cups have a polyethylene (not styrene) lining. Many cups made for hot drinks have polystyrene on the outside, some are multi-layer paper and some have a cardboard sleeve.
> Not really, it's not worse compared to many other things people consume.
Yes really. Other things being worse is whataboutism to derail from the issue.
Coke, specifically, from can bottle. If you drink the brown sugar suspension that is fountain soda, you are just marching toward diabetes. The chemistry is unique between these products.
> Could this mean it's a bad idea to drink Coke from a styrofoam cup?
> It's generally a bad idea to drink coke
All coke colas (and most other products) are insanely high in fructose. The distinction to "drinking coke" is that it's a coke carbonated cola product. The conversation isn't nuanced that a distinction is being made.