I've just started taking Chantix. My doctor recommended a slow start. Working up to the 2 pills a day, she recommended 1/2 tablet once daily for 6 days, then 1/2 tablet twice a day for 6 days, then 1 tablet for 6 days - then the 2 pills a day. So far, I'm on day 5 and haven't had any side effects. Good luck to all of us!