I stopped because I realized that I was enjoying this too much, and to continue could have harmful ramifications for myself. Something that felt that good, something I don't really know everything in it (chemicals, pesticides, etc.,) did not feel like a good thing in the long run.
It will be fascinating to see what pharmaceutical companies will do with it, which could be good or really awful for humans. Nothing is quite as addicting as happiness, especially in a pill.