LOL.

Okay, your body builds a tolerance to any mind-altering substance with extended use; thus THC. I can't beleive you guys are asking this. For instance; let's say theoretically you had a migraine for 30 days, you take 2 tylenol and it goes away for 6 hours. After about a week you'de have to take 10 to feel it.

NOTE: Your liver would fail.

I'de get more in depth but I have to write an essay, later.