Six months for me. If you want a smoke - vape. It will take longer to overcome the feeling (5 min) but then it will be gone - longer gone each time. Stand in front of the mirror and determine if your skin is not a lot better (even while vaping as you do it). Walk up a flight of stairs after 1 week. Listen to your non-cough. vape at your computer and watch the cloud gather at the table lamp. Notice that you don't stink. Stop lurking everywhere to have a smoke with dubious characters. Give up the walk-of-shame at the local cigarette dispensary. Stand tall and tell the world―I vape so buzz off and leave me alone!