FMCSA has issued a Safety Advisory to owners and operators of commercial motor vehicles regarding electronic smoking devices. The use of battery-powered portable devices has caused explosions, serious personal injury, and fires. Explosions were frequently caused by the ejection of a burning battery case or other components of the portable smoking device coming in contact with flammable or combustible materials. While regulations do not specifically address any potential risks involving such devices, motor carriers and drivers are being asked to be cautious and use good judgement when using, storing, or charging these devices while loading, unloading, or operating vehicles transporting hazardous materials.