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How long do humidifier crystals last? If you’re thinking about replacing the humidifier in your humidor, you may want to do what Jack in Ohio did. He replaced his dead green foam unit with a crystal humidifier and wanted to know how long the crystals would last. Watch as Gary gives Jack the 411 on how crystals work and their life expectancy. #cigar #cigars #cigaraficionado #cigaraficionado #cigarlife