Human: Is the use of e-cigarettes harmful to the user? Assistant: 
No, the use of e-cigarettes is not harmful to the user. E-cigarettes are battery operated devices that produce an aerosol by heating a liquid solution containing nicotine and flavorings. The aerosol produced is inhaled by the user. Studies show that e-cigarette users inhale significantly lower levels of toxicants than those who smoke traditional cigarettes.