20 Seconds trying a friend's Copenhagen doesn't really count as being a former dipper, but I did smoke cigarettes for many years. I haven't had one in over 3 years now and don't miss it at all. The physical component to tobacco addiction only lasts a few days and the rest is psychological, so you can absolutely get control over it. In my opinion, there are 2 important attitudes toward tobacco that you need to acquire to be really successful.
1. Don't think about quitting as "giving it up". It's a nasty, expensive habit that you should be glad to get rid of. As long as you feel like you're missing out on something by not chewing, you run the risk of doing it again.
2. You have to make a mental disconnect from it. Tobacco has a lot of craving triggers. You have to be able to diminish their hold over you. You accomplish this by not allowing yourself to think about dipping when you encounter your triggers for tobacco craving. Intentionally direct your mind to other things and it will become automatic after a while. Seeing other people smoke was always a trigger for me. My husband still smoked for a year after I quit and I realized that if I were to be successful, I could no longer have a mental association with it- I had to feel complete apathy towards tobacco.
I hope this helps you in some way. I know how powerful tobacco addiction can be, but you can absolutely overcome it. Wish you the best of luck with it!