As I posted yesterday I received some Vuse coupons in the mail and bought one. Tried it and was unimpressed with the flavor so I wondered if you could add a better tasting juice to the cartridge. Yes you can... Take a razor blade and cut around the top of the carto to remove the black wrapper, be careful not to cut yourself. Take a small screwdriver and pop off the black plastic top. It wasn't easy and pretty much destroyed it. Now just drip some new juice around the inside of the carto. I had a bunch of other cartos with the white rubbery tops do I just used one of those for a new top. It fits nice and snug. Wala, you're done. It made the flavor a lot better. Tolerable enough to use for the last few hours. So now I could see using the Vuse on a regular basis. It just needed a juice hack.