Hello! I'm new to using these kind of electronic cigarettes. I recently purchased a buck naked express kit, but I what do I do when I want to switch flavors? It comes with directions for cleaning the tank, but the guy at the shop where I bought it said the tank is disposable and that he just recommended vaping it dry and using a similar tobacco flavor. He also said that I should buy a reusable tank because I will have to replace mine in a month. He said the cheaper parts that they sell are interchangeable with it, but I am hesitant to use anything beside something made by the manufacturer. It also seems like the button you press when you inhale gets stuck a lot Thanks in advance. Oh, and he also said if I clean it with water like it says to, I will never get the water out. I am so confused as to what to do, and I don't want to mess anything up.