Cyra where are you from? Noticed your old post said something about VA Tobacco Co. Was wondering if you were local.

Anyways, it's not common for mold to appear in your humidifier IF you use a 50/50 solution and distilled water to fill it. If you use regular tap water, there are impurities in there that will dry up and turn into your so called "white spots".

Are you refilling a butane lighter or a regular lighter?

Andrew