Alright so i have a question i havent found a answer by research yet. So i had a friend offer me his old lava tube kit for dirt cheap and its a kit i was plannin on gettin as i want a vv kit. So my question is when buying a used tube mod, what are things to look at or to make sure that is in perfect working order before you spend money on it? Ive read that one thing with ecigs is you get what you pay for. I understand that and have learned my mistake. With this lavatube i cant tell if its a knockoff or of its the real thing but does it matter if its used? Do the knock offs last just as long? I am more then willing to buy a new device this is just a deal i dont wanna pass up. 25 bucks for a tube mod, extra batt and charger, 3.5 acrylic tank with extra boge carts, drip tips and a case for all. He told me hes hypoglycemic and cant vape any longer......never heard that but i guess its true.