I was told nicotine leaves your system after 3 days and from there it is the hand to mouth habit, i think that helped. Their quit program allows you to smoke normally for one week while on Champix. Here is a small overview of the quit day by day – your quit smoking timeline. We both expierece small urges to smoke but Chantix seems to be blocking most. I am so glad I spent the $11 dollars on this book.