[ti:Mystery, Deadly Illness Linked to Vaping in 2019][by:shang05.com][00:00.00]更多听力请访问shang05.com[00:00.04]In 2019, U.S. health officials became very concerned[00:05.16]about a mysterious illness related to vaping.[00:10.76]Vaping is the act of breathing in vapor through the mouth.[00:16.56]It uses a battery-operated electronic device to heat liquid and mix small particles with air.[00:25.96]An illness tied to vaping can make a teenager's lungs look like those of an old person.[00:34.60]The Centers for Disease Control and Prevention, or CDC reports, as of December 17,[00:42.76]that more than 2,500 people had been hospitalized for injuries connected to vaping.[00:52.52]People in 27 American states have died from the illness.[00:58.44]The CDC says additional deaths are under investigation.[01:04.04]More than 50 deaths have been blamed on vaping.[01:08.68]However, new numbers are expected to be released Tuesday.[01:14.68]Vaping is popular among people who want to avoid smoking tobacco cigarettes.[01:21.32]It also has become a way for people to inhale marijuana to get high.[01:27.76]Most of the illnesses have occurred in people who vaped THC,[01:32.92]the substance in marijuana that produces a high.[01:37.68]In November, American officials reported the discovery of Vitamin E acetate[01:44.00]in lung tissue from 29 patients.[01:48.56]The substance is believed to be used in illegal vaping products containing marijuana.[01:56.12]The CDC called Vitamin E acetate a "chemical of concern."[02:01.48]It recommended that the substance not be added to e-cigarette[02:06.60]or vaping products while the investigation is ongoing.[02:11.92]Chemicals are added to e-cigarettes and other products to provide different tastes.[02:19.80]They are then inhaled while vaping.[02:22.44]Even when the e-liquids do not contain nicotine, the lungs still take in other chemicals.[02:31.80]While many of the flavorings are considered safe in foods, earlier research[02:37.60]has suggested that inhaling vapor from these chemicals[02:41.84]may damage the lungs, blood vessels and heart.[02:47.44]More than 20 percent of U.S. high school seniors said they vaped THC in 2019,[02:55.48]researchers reported in December.[02:59.36]The researchers also found that seven percent of students as young as 13[03:05.16]reported vaping THC in the last year.[03:08.68]Richard Miech of the University of Michigan led the study.[03:15.96]The findings appeared in the medical publication JAMA.[03:21.00]"Whatever teens can vape has increased dramatically in the last few years," he told Reuters.[03:29.96]New information about the harmful effects of e-cigarettes also was released last month.[03:37.48]That study showed the use of e-cigarettes increases the risk of developing chronic lung diseases,[03:45.28]but less so than smoking regular tobacco cigarettes.[03:51.08]The study was published in the American Journal of Preventive Medicine.[03:55.64]It looked at 32,000 American adults between 2013 and 2016[04:03.80]who had no signs of lung disease when the study began.[04:09.28]Scientists found that those who used e-cigarettes were 1.3 times more likely[04:16.08]to develop chronic lung diseases such as asthma, bronchitis,[04:22.04]emphysema, and chronic obstructive pulmonary disease.[04:28.40]For people who used both e-cigarettes and traditional cigarettes, the risk was nearly three times higher.[04:37.28]Last month, the World Health Organization[04:40.68]called for additional rules on the marketing and sales of e-cigarettes,[04:45.48]as more information about the possible effects of these products becomes known.[04:52.00]Health officials are increasingly worried about reports of deaths and illnesses linked to vaping.[05:00.44]They see the recent death of a young man in Belgium[05:03.80]and reports of vaping-related illnesses in the Philippines as a reason to take stronger action.[05:12.48]I'm Jill Robbins. 更多听力请访问shang05.com