Milestones Milestones mark accumulations of smoke-free-days such as one week, 30 days, 180 days, 365 days, etc. Many have Rewards attached to them. Some Milestones have their own Quitticisms (like Tweener, for the 50-day Milestone).
NOPE- not one puff EVER. If you want to sabotage your quit, just one puff will do it and next thing you know you're smoking again.