text: how long nicotine stay in urin and blood? i smoked cigaret for 15 years 3 or 4 stick a day. i've heard about 4 days.  when i quit smoking several years ago... here's what i did.  i took a two liter bottle of water and went into a sauna.  i kept on drinking water.  when i started to sweat heavily, i would exit the sauna and take a quick shower... rinsing the sweat off of me.    i would then return to the sauna and repeat the procedure until i had drank all the water.  i felt great!  that first day went fairly easily.  the next day was pure torture.  i think i sweated out all the nicotine that first day and had massive withdrawels on the second.  still, my withdrawel lasted a much shorter time than other times i attempting quitting.  good luck!