Public health

This photo made available by the New York State Department of Health on Sept. 5, 2019 shows a few of the cannabis-containing vaping products which contained high levels of vitamin E acetate. Vitamin E acetate is a key focus of the department's investigation of potential causes of vaping-associated pulmonary illnesses. (Mike Wren/New York State Department of Health via AP)

In this photo taken Sept. 20, 2019, David Alport, owner of the Bridge City Collective marijuana dispensary in Portland, Ore., goes over sales numbers with the store's general manager Cameron Moore. The company has seen a 31% decrease in its sales of vaping products in the past two weeks. “It’s having an impact on how consumers are behaving,” said Alport. “People are concerned, and we’re concerned.” (AP Photo/Gillian Flaccus)

FILE - In this Tuesday, April 10, 2018 photo, a high school principal displays vaping devices that were confiscated from students at the school in Massachusetts. On Thursday, Sept. 26, 2019, the Centers for Disease Control and Prevention said 805 confirmed and probable cases have been reported to have a vaping-related breathing illness, and the death toll has risen to 12. (AP Photo/Steven Senne)

B.K. Morris, a nurse with MedStar Visiting Nurses Association, gives a flu shot to Secretary of Health and Human Services Alex Azar during a news conference in Washington. The flu forecast is cloudy and it's too soon to know if the U.S. is in for a third miserable season in a row, but health officials said Thursday, Sept. 26, 2019, not to delay vaccination. (AP Photo/Lauran Neergaard)

Zimbabwe's President Emmerson Dambudzo Mnangagwa addresses the 74th session of the United Nations General Assembly, Wednesday, Sept. 25, 2019, at the U.N. headquarters. (AP Photo/Frank Franklin II)

FILE - In this Dec. 20, 2018, file photo Juul products are displayed at a smoke shop in New York. Philip Morris and Altria have ended merger talks and JUUL’s CEO is stepping down from the top post as criticism over vaping continues to intensify. The companies confirmed last month that they were in discussions, more than a decade after splitting itself into two companies. (AP Photo/Seth Wenig, File)

FILE - In this April 11, 2018 file photo, a high school student uses a vaping device near a school campus in Cambridge, Mass. Massachusetts Gov. Charlie Baker is declaring a public health emergency and ordering a four-month temporary ban on all vaping products in the state. The Republican governor made the announcement Tuesday, Sept. 24, 2019 amid growing concern about the health effects of vaping products. (AP Photo/Steven Senne, File)

Press Association

Buckets are seen in a queue to fetch water at a borehole in Harare, Tuesday, Sept, 24, 2019. The more than 2 million residents of Zimbabwe's capital and surrounding towns are now without water after authorities shut down the city's main treatment plant, raising new fears about disease after a recent cholera outbreak while the economy crumbles further. (AP Photo/Tsvangirayi Mukwazhi)

Pakistani patients suffering from dengue fever, a mosquito-borne disease, are treated in an isolation ward, at a hospital in Rawalpindi, Pakistan, Tuesday, Sept. 24, 2019. Pakistani health officials are battling an outbreak of dengue fever in the South Asian nation, confirming over 10,000 cases and 20 deaths in recent months. (AP Photo/B.K. Bangash)