I'm not sure about these e-cigarettes, it seems to work fine and subdues my craving, but it does make me cough especially in the morning and my chest feels a little tight, kind of like after I've smoked a lot of fags. The liquid lasts long enough and the price of everything is fine. I've looked up the NHS report which states that there supposed to be 95% safer than smoking, but they still produce carcinogens when inhaled and its probably not best to smoke them around other people or children. (passive smoking) Its working for me for now, but I'm not sure if this industry is fully regulated or even if enough research has been done on the effects of using them.