Education: village idiot
However I do trust the experts in the field, such as those who write up OSHA and MSDS reports; reading the MSDS for propane, it's listed as only a slight health hazard (mostly due to asphyxiation).
So unless your query was of purely academic nature, with abstraction of the scientific particulars it's been deemed relatively safe when used normally (i.e., don't huff that damn stuff).
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