The microparticle filters in the Firefly 2+ Plus can eventually get clogged up and start to give your vape a flavour that you can't get rid of through simply cleaning it. When that eventually happens just grab one of these packs of replacement mouthpieces and get back to that perfect flavour again. These are also a great option if you want to be able to share your Firefly 2+ Plus with others without having to worry about constantly cleaning the mouthpiece, just switch it out and you are good to go.
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Firefly 2+ (Plus) Mouthpieces (2 Pack)