Airports and hotels are generally on their own when deciding how to deal with e-cigarettes
There have only been 3 studies on Diacetyl, and only 2 of them are to do with Diacetyl in E-Cigarettes

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Studies indicate that the connection between using e-cigarettes alone or combined with regular cigarettes and diabetes or prediabetes is unclear, wrote lead investigator Sulakshan Neupane, MS, who is associated with the Department of Agricultural and Applied Economics at the University of Georgia
According to the government, a study by the state health department and experts revealed that e-cigarettes also encourage the younger generation to use conventional cigarettes