I started out using any liquid thinking it's all the same, but through trial and error and a lot of money spent let me tell you that it is in your better interest to research e liquid, just because you get 18ml bottle for $5.99 and it taste good you need to know what your putting in yourself, I HAVE LEARNED TO MAKE SURE ITS MADE IN THE USA 1st then ask to see what the ingredients are and if they cant show you proof of whats in it I would pass it up, Ilook for organic made in the usa and make sure there is nothing in it that shouldn't be. The cost of a good organic e juice is really not that bad and for a couple $$ more remember it's your health. IMHO. THANKS FOR READING, and if any one has more info on better liquids please reply because I'm always willing to learn