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I wanted to talk about what I believe is misinformation on this topic. I have read a ton of posts relating to how butane is "not toxic" and perfectly safe. I have seen many posts created by people asking if butane lighters pose a health risk. The response to all of these posts is "when butane is...
This resource covers two aspects relating to the butane lighters.
The quality of the butane
The correct technique for using the butane to fill your lighter
The quality of the butane
The quality of the butane relates to how well filtered it is, the higher the quality the less contaminants are...