Do Hershey products contain genetic engineering?

Answer 1

That depends a great deal on how you define genetic engineering. Farmers have been engaging in selective breeding of plants and livestock since prehistoric times - which is essentially a type of genetic engineering.
Due to pressure from some anti-GMO groups Hersheys has begun transitioning the ingredients in its products to use less and less GMO and hormone augmented products such as getting away from using milk from cows that have been treated with growth hormones to stimulate milk production and switching from high-fructose corn syrup back to simple sucrose sugars. The biggest push has been in products intended for the European market which has overwhelming phobias about anything that might be GMO related even when there is no evidence of harmful effects (and in a few cases actual significant evidence of significant benefits). Some of the changes will definitely result in more healthy products - others are nothing but hype.

Answer 2

There could be. If Hershey's uses high fructose corn syrup (HFCS), it is very likely that the Kisses are GMO. It is also possible that the candy contains other GMO ingredients.