Certain juices like cinnamon or lemon etcetera react with the plastic tanks. Some will simply cloud the tank making it look murky. Others will eat away at the tank until there are holes. If it's reacting with the plastic tank you don't want to vape the liquid inside that tank. Toss what's in the tank. It now has plastics inside of it. Then get yourself something that can handle "tank crackers". Metal tanks and Pyrex tanks can handle it just fine.
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