Well, I fell off the wagon for a few months, and never really stopped smoking before. In some cases, such as mine, it may just take a major realization to keep you off. Mine was literally choking on air after waking up one day... Knew I had to get away from cigs once and for all. Since then I ordered a bunch from my favorite vendor (copper creek, woo), and have smoked no more than one cig a day, most days smoking none. Last night was an exception, but my trigger was not having any charged batts...

Paid for it with hacking up brown goo today, so pretty sure I'm just done. Easy enough to avoid that one bummed cig every day.
Really, just get yourself psyched about some new vendor or something... DIY even, that did it for me before.