I have been trying to quit my use of snuff. I have been using it for about 40 years, plus minus a year or so. It's hard to quit, really hard. After getting gout, which is really painful, I decided to quit drinking beer the only beverage with alcohol I like, I don't see any reason for drinking something I don't like only to get alcohol. Anyway, the times I have tried to quit with snuff before failed usually when I got drunk. Therefore, I take the opportunity to quit now. To quit messes up my sleeping badly. I usually wake between 3 or 4.
The nicotine leaves the body after two, maybe three weeks. The 40 year old habit doesn't disappear.