From the SFATA web site, the most complete collection of US vaping product overheating, fire, and explosion reports, 92 so far as of the end of last year. Interestingly, only about half were reported to the media.
http://sfata.org/wp-content/uploads/2016/03/Tob-Control-2016-Rudy-tobaccocontrol-2015-052626.pdf
http://sfata.org/wp-content/uploads/2016/03/Tob-Control-2016-Rudy-tobaccocontrol-2015-052626.pdf