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From the wikipedia page about fog machines[1]: "Short term exposure to glycol fog can be associated with headaches, dizziness, drowsiness and tiredness. Long term exposure to smoke and fog can be related to upper airway and voice symptoms. Extended (multi-year) exposure to smoke and fog has been associated with both short-term and long-term respiratory health problems."

[1]http://en.wikipedia.org/wiki/Fog_machine

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I would wonder if this isn't caused by the fact that it's difficult to breathe something that isn't the fog when you're in an area with a fog machine. I don't know any smokers who don't take a breath of fresh air when they're smoking, or e-cig users who don't do the same. In a room with a fog machine going, there may not be any fresh air to breathe.

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