Thanks for this! The original post’s explanation didn’t seem to me to hold water, and your video supports my hunch. It seems unlikely, especially when sitting near a fire instead of standing looming over it, that a person would block enough air to change the flow of the smoke column. It’s more likely that in still air, relatively small changes in current move the smoke easily, and that people only notice when the smoke is in their faces and not all the other times it blows other directions.
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