By all means, if you dislike being addicted to something because it interferes with life, because it's expensive, or because you're worried it will eventually be found to have modest health harms, then quit. But moving from smoking to gum gets you 90% of the benefits.
The nicotine itself doesn't appear to be a carcinogen² so unless your chewing gum is abrasive, I would be surprised if it caused cancer, but the scientific literature on oral cancer and nicotine chewing gum is almost inexistent so my opinion is mostly based on a feeling.
1- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6172921/ 2- https://cancer-code-europe.iarc.fr/index.php/en/ecac-12-ways...
Zyns are pretty clean as far as ingredients go but it is a plastic pouch, and they do contain artificial sweeteners.
I found NicNac Naturals (nicnac.com) which is sold out of the UK and it’s a fully dissolving mint, no plastic or non-natural ingredients involved