I have found one over three separate occasions, whilst letting people try my DIY juice I get offered to try other peoples store bought liquid. Is it just me or do alot of people let their delivery devices go to long without maintenance. I took a toot off my brothers knock off kanger style tank. It tasted like he had not changed the atty for 6 months! I almost threw up and said "Man you need to get a some replacement heads for that tank" He looked at me weird. This has happened to me a few times with different people. I change my carto's out at the first sign of fouling. Am I alone in this, or is my pallet just super sensitive?