I've stopped them in the past more times than I can count for various reasons.

First time I felt better and decided I didn't need them. Backfired of course.

I also stop them when I'm not feeling good though. Part of me decides they obviously aren't working so what's the point in keeping on taking them? Another part of me is very self destructive so when I start going downhill I generally just start doing all the wrong things without even really thinking about it, it's just an automatic response. And another reason is so that I can stockpile...