Yeah, I felt pretty stoopid for trying it but I learned about it in high school and was desparate. It must have been the exercise and water consumption. I feel that this whole belief that thc stays in your system for two weeks is a bunch of bullsh*t perpetrated by those who dont want you to do it. I did do this and I did pass the test so therefore it must have been the excessive sweating and water drinking and not the niacin. Dont take niacin it is very uncomfortable and apparently does not work. Sweat and replenish. Anyone who wants to tell me different is full of sh*t.