I used to have these issues and I’m sorry to say you are, in fact, using it wrong.

If you find your coils burning out regularly when the tank is not empty, it’s most likely because you haven’t properly set the power on your vape. My coils have the appropriate power printed on them, and they only ever burn out when I forget to fill the tank. My current coil has been in operation for 7 months, I have 25785 puffs on it (the vape counts them). Before this vape, I didn’t care about setting the power and my coils would constantly burn out and I had the same frustration as you.

My current vape also does not leak, despite the fact that I manually replaced the seals when I broke the glass tank (so it’s not just that the factory made it well).

As for the liquide, yeah. Personally I buy base and flavor in the mail and mix them myself, but that’s probably also illegal for you.

Be careful with disposables. Their nicotine levels are way higher than advertised, because they want to build the addiction to their product.