Loon Reloaded got me off of cigarettes (18 months now, after 45 years of smoking). I always keep four devices on hand, two devices in use while the other two are charging. They have never failed me. I have a tendency to lose them, before actually wearing them out. Two of my devices are still going strong after 18 months, which is amazing considering how many times I have dropped them on concrete. So much cheaper than smoking, and Heavy Heads is so much cheaper than the retail stores.