I've completed 40 days and 40 nights of smoke-free living since my quit back in March. That seems like a good day to view as a milestone.
After all, the Bible says it rained 40 days and 40 nights after Noah built the ark. Moses spent 40 days on the mount. Jesus fasted for 40 days in the wilderness.
While I'm not a particularly religious man, I do find it fascinating that 40 days is so prevalent in the Bible.
At the very least, having lived smoke-free for 40 days and nights, I have something to celebrate!