Interesting, I'm not familiar with this product. Looks to be relatively new and little is known about them. So, no data on efficacy or comparative nicotine delivery to other nicotine products. For now, seems relatively harmless compared to cigs, but gum irritation seems to be a potential issue.

If you are talking about snus, they aren't harm free but would be considered a form of harm reduction. Last I ready,can still potentially lead to various oral cancers, but at reduced risk.

It's true, those can cause cancer as well, but not from nicotine. It's from all the other junk that is in the chew. On a public health scale though, the harms from smoking far outweigh chew.

Nicotine dependence and withdrawal can be uncomfortable, but the worst consequences are from smoking and all the carcinogens that come with that method of intake. Nicotine by itself is not carcinogenic. Chronic nicotine use can change brain neurobiology in various ways and affect how people deal with stress, sleep, and general reward. But the smoking part is what kills people and has the most harmful health effects