I bought the one they sell at the Riverside Indian Smoke Shop and I thought it was the greatest thing ever but it didn't last more than a couple of weeks before it went on the fritz and got returned. I may buy a high end model and give it a try. I noticed after a few days the smokers cough was gone and my aerobic capacity was increasing. I know being addicted to anything is bad but I am convinced the e-cig is better for me than a pack of Camel Turkish Golds every 24 hours.