Oblivionage@op isn't the actual shit thats in chewing tobacco worse than nicotine. doing 0mg or 3mg is still horrible for you isn't it?
As reilly said, the health concern isn't nicotine. Nicotine is on par with caffeine really, though people argue its more addictive which I think is a valid claim. And even using 3mg nicotine is very very low.
The thing with chewing tobacco is, is that it isn't has horrible for you as people think, though it is still bad for you. While it isn't good for you by any means, its a lot less harmful to you than smoking cigarettes is. I just feel a lot of people have the misconception that they are equally bad for you, which is false. Snus (a Swedish invention similar to chewing tobacco but can be swallowed), has been said to be even less harmful. Chewing tobacco doesn't give you the numerous side effects that smoking does, nor as severe.
Research done by an oral pathologist at the University of Louisville named Brad Rodu, as well as many other credible researchers and institutions actually show that oral cancer rates among those that use chewing tobacco are actually quite low. And as I said before, you don't really have any other adverse side effects besides receding gums, your lip getting a little sore, leukoplakia (which almost never happened to me), and in very rare cases, hairy tongue. Though I think this was used more as a scare tactic to keep people away from chewing tobacco, because I have never known anyone with it, or knew someone that knew someone that had it. This means the side effects do more to effect the appearance of your mouth more than anything (yellow teeth, receding gums). Although of course, there are still the people out there that do actually get oral cancer, as well as esophagus and stomach problems if they swallow it (thats only something the hardcore dippers do).
Sorry this was somewhat lengthy post, this is just something I researched a lot, and actually did a research report on in school. Regardless, all tobacco is bad for you to some extent, that is why I switched to vaping.