Yes, it is.
Vegetable glycerin is a chemical, and propylene glycol is. Pharmaceutical grade nicotine is the same that goes into gums, patches, and inhalers. Then there are flavourings. Flavouring is not a single ingredient, but rather a category. Those are food flavourings and there could be a plethora. Somebody could put one strawberry flavour extract to produce the desired effect and somebody else could put a mixture of 12. It really varies.