I know this has been said before but the Nic-O-teen gum is harmless and might help prevent dopamine loss. I am experimenting with the gum myself, its not terrible tasting though has a weird aftertaste, to me anyway.
Re NicoTINE:
There are also nicotine lozenges and patches.
https://www.nicnac.com/pages/shop
The blood orange flavored lozenges are recommended.