I turn 40 this year. I have been dipping on and off since I was 14, and dipping almost constantly during waking hours for the last 17 years. I have quit before (on one occasion I quit for an entire year before starting again the day before my wedding).
Anyway, my last dip of Copenhagen was on December 3rd. That day, I purchased Nicotine gum and chewed it for two weeks before running out. After I ran out of gum, I decided I'm not going to buy any more and completely quit.
Within the first week, I noticed I was getting angry very easily. The first month was very tough. My wife says I was very mean, and I agree. Last night, I was really on edge due to a stressful day at work. After reading this board, now I see that other folks have anger issues after quiting as well.
Since I'm past the one month mark of not having any nicotine, I feel like I've made a big change in my life. Every once in a while, I will find info on how dipping is safer than smoking and I almost convince myself that it would be safe to chew. However, I'm sticking with it this time. I have two beautiful daughters and the oldest was very dissapointed that I chewed.
Take care and best of luck to all you other dipper quiters out there!