Voodoo is a real gunker. Refilling a tank more than twice, will cause the built up gunk to leech back into the tank. It mutes the flavor just a little bit....
I think VooDoo changes a lot in the tank, as it gets darker and darker. I think it's like making a wine reduction. You vape off the easy stuff, leaving the remnants behind, so it gets darker. You realize this when you refill it. And I think the remnants building up is why you clean voodoo tanks and coils more often.
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It's a high maintenance Mistress...