The 3 month bug-

Why does the 3 month mark seem to be such a common time for people to either feel worse, go back to smoking, have the strongest cravings, etc. Of all the 'quitting' articles I've read, there are many that tell you what happens to your body in time.. 72 hours, 2 weeks, 1 year, etc.. but I never see anything mentioned about hitting 3 months, yet that seems to be such a common factor in everyone (at least here among this board). I'm only at 2 weeks today (14 days, woohoo!) and have no desire to ever return,quit smoking, and whatever "happens" at 3 months will not scare me,quit smoking now, I'm just kind of curious what I might have ahead of me. I try to be prepared for things