Help Please! I've been interested in trying marijuanna for some time, so I thought it would be a good idea to go buy a half of a brownie. So I ate the half in the matter of 2 days and it's been 3 days since I had it. The problem is that I feel lightheaded and incoherent but not high and it's 3 days after I had the brownie. It's very hard to concentrate on a task so if anyone could fill me in it would be much appreciated. This was my first time of course.