So I figured ill pass this on to my fellow smokers...so my unemployment ran out and now I need to get clean for a job. This is what I did...now I'm 5'10 & 210 lbs. I told the guy at gnc that I needed to clean my system out completely. Not mask it but clean it out completly. He recomended niacin, I said ok n purchased it ($7.00 for 100 500mg tablets). He said to excersice after taking sum. That the sweating will speed up the process. So I was taking 2 pills every 4 hours had the hot water (shower) runing till it looked and felt like a sauna n started jogging in place for like 15-20 mins. Omg in just those 15-20 mins it seemed like I just did a 1hr work out because I was sweating prefously! my shirt pants & even boxers were soaked with sweat! I did this every day for 2 weeks and later got a home thc test n passed it. Mind you I was smoking an 3.5g of kush every 3 days. And I'm not the skiniest person in the world. I know everyone is difrent. Just thout ide pass this along to c if it will help anyone else. I excersized 2 times a day 15-20 mins but kept taking the niacins 2 every 4 hrs. Let me know how it works out for any of y'all if u decide to try it....peace.