Parker said there was no way to recognize the brand of e-cigarette Holloway was smoking, but the battery appeared to be rechargeable lithium because there was a recharging station in the study.
Holloway, a Vietnam veteran, photographer and father of three, reportedly stopped smoking two years ago and turned to e-cigarettes to kick the habit.
Parker said the explosion knocked out all Holloway's teeth and part of his tongue. The event also set fire to the room.
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Electronic cigarettes have become a popular crutch for many who have quit smoking. The battery-operated smoking-cessation device simulates the act of tobacco smoking through physical sensation, appearance and even flavor.