I’ve never had fireball whiskey but I was curious about the ingredients. Looks like they fixed it to comply with EU regs: As of 2018, Fireball does not use propylene glycol in any of its products

I’m curious what other products do have it in large amounts though.

The FDA law defined maximum limits for the use of propylene glycol in various food categories under good manufacturing practices:

2.0% for general food categories
2.5% for frozen dairy products
5% for alcoholic beverages
5% for nuts and nut products
24% for confections and frostings
97% for seasonings and flavorings