These requirements cover the battery-operated electrical systems that use consumables containing varying compositions of flavorings@ propylene glycol@ glycerin@ and other ingredients@ with or without nicotine@ which is heated into an aerosol that the user inhales. Examples include but are not limited to vaporizers@ vape pens@ hookah pens@ e-hookah@ e-shisha@ e-pipes@ electronic cigarettes@ e-cigarettes and electronic nicotine delivery systems (ENDS). These systems encompass their charging systems@ components@ parts and accessories. These requirements do not cover the consumables@ such as e-liquids and other inhaled aerosol substances@ wicks@ and other particulate matter inhaled during use@ nor do they cover substances in the emissions from the operation of the devices. NOTE For example@ heavy metal emissions in the aerosol and environmental exposure. These requirements do not consider the physiological effects of any consumable used with the devices.