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"We are encouraged to find many studies are now under way, particularly as electronic cigarettes are an evolving technology," said Jamie Hartmann-Boyce, one member of the Cochrane Tobacco Addiction Group

Regarding the reason for trying e-cigarettes for the first time, more than three-fourths of the respondents (84.44%) responded that they saw a friend/family member/famous person trying e-cigarettes, so they wanted to try e-cigarettes

There's little solid research on this, so your best bet may be to keep a food diary to see whether any foods or drinks seem to trigger your headaches

Never empty it onto a patch of ground or on a parking lot