Battery field-failures occur in electronic cigarettes; reported frequency of such events per year roughly agrees with what a large Japanese company’s Lithium-based battery data would predict.
Seeing increasing numbers of statistically rare but serious incidents occurring with electronic cigarettes in which their Lithium-based batteries have had thermal runaways and even violent explosions; some have caused significant human injuries.
Incidents occurred inside buildings and in motor vehicles.
An unknown percentage of such events may have been caused by low energy nuclear reactions (LENRs) that are potent triggers for catastrophic types of battery failures.
If you doubt either the frequency or seriousness of such incidents, then query Google using the search terms e-cigarette fire explosion and see many different stories.
Anyone who smokes e-cigarettes should treat them with the proper caution and great care accorded to any type of device that stores a great deal of chemical energy in a small compact package, such as M-80 mega-firecrackers.
Many catastrophic e-cigarette failure incidents are associated with charging of their Lithium-based batteries; battery charging process is very similar to many LENR experiments using electrolytic cells.
Lastly, significant safety risks associated with e-cigarette devices are not well-understood or widely appreciated by majority of customers and device manufacturers.