I use dilution every 3 weeks. i smoke for 14 days and abstain for 7 and use dilution every time for the past year and its worked great. I am 6ft 185lbs not skinny but i eat alot and my metabolism works well. I also work out like crazy for 4 days then become lazy and eat fatty foods. I take Multi-Vitamins and fiber supplement. Not to mention other vitamins that help speed up your metabolism.