As another commenter alluded to I was referring to the crash or hangover. As for withdrawal I don't think I have ever felt it with nicotine but it might be bec

As another commenter alluded to I was referring to the crash or hangover. As for withdrawal I don't think I have ever felt it with nicotine but it might be because I just don't ever do enough (the most pieces of gum I have had in one day is 40mg of nicotine.. ie 10 pieces). I have had a nicotine hangover with cigars but this is usually because alcohol is involved as well as I believe cigars lower intake of oxygen (just a theory.. probably wrong). Caffeine withdrawal is awful.. absolutely awful for me. Headaches for days. I usually give up and pound 4 ibuprofen with a large cup of coffee.