I started using a vype unit because I wanted to stop smoking tobacco but don't think I can do without the nicotine after having smoked for decades, the main drawback however is estimating how much nicotine I have ingested, there is no natural break as there is when you finish a cigarette, the unit itself is also rather large, I was not able to see the size of the unit as the retailer had none that were not in their packaging , I may not have bought the unit had I seen the appearance, having said that it does seem to work well and the charge seems to last a reasonable time, but I would not use it in public!.