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If you do it regularly I'm pretty sure it is. Burning your face is also painful and the aftermath looks bad.
Here the answer from the internet
When people or animals come in contact with propane, it’s usually in its gaseous state, making inhalation the most common form of exposure. Because it replaces the oxygen in your lungs, the symptoms of propane inhalation are related to oxygen deprivation, and not to any toxicity of propane itself. Physical activity will actually make the symptoms worse.
https://propane.com/staying-safe-around-propane-fumes/
#18 for sure