I got several flavors to try out in the 10ml bottles. Then I ordered a 30 ml bottle of mint flavor. It was really great in the first bottle, but the new one is super bitter. It has nothing to do with the e-cigs. Smelling the juice directly from the bottle, it totally smells like antifreeze. The old bottle of the same flavor and strength (6mg) smells sweet and minty. Is this something I should be concerned about or does it just need to age? If so, how long does it take?