The United States plans to raise the age limit for vaping to 21, U.S. President Donald Trump said.

U.S. health officials reported 1,888 confirmed and probable cases and 3 more deaths from a mysterious respiratory illness tied to vaping, taking the total death toll to 37.

A Massachusetts judge ruled that a four-month ban on the sale of vaping products the state adopted in response to an outbreak of lung illnesses linked to e-cigarette use was likely “unlawful,” but he gave the state time to fix its defects.

E-cigarette or vaping-linked lung injuries that have killed 29 and sickened more than 1,000 people in the United States are likely to be rare in Britain and other countries where the suspect products are not widely used, specialists said.

U.S. health officials said there may be more than one cause to the outbreak of the mysterious lung illness linked to e-cigarette use, and said they do not see a meaningful drop in new cases.

Kroger Co. and Walgreens Boots Alliance Inc. will stop selling e-cigarettes at their stores, amid heightened regulatory scrutiny of the product and reports of lung disease and some deaths linked to vaping.

Doctors studying lung tissue from people with vaping-related injuries have ruled out one diagnosis as a probable explanation of how vaping harms the lungs, further deepening the mystery over the exact cause of hundreds of illnesses in the United States.

A U.S. House panel sent letters to four e-cigarette companies asking them to stop all print, broadcast and digital advertising of their products in the United States.

Massachusetts imposed a four-month ban on sales of all vaping products, amid what officials called a national public health emergency that so far has been linked to nine deaths.

The number of Americans sickened by a severe vaping-related illness continues to increase, according to a U.S. health official speaking at a Congressional hearing.