Four deaths were reported as a result of a mysterious respiratory illness linked to smoking e-cigarettes during the past week, which raises the total number of deaths to 52, according to US health officials, according to Reuters.

And the US Centers for Disease Control and Prevention announced the treatment of 118 new cases in hospitals in 50 states and the District of Columbia and two areas of American territory as of December 10, and the number of people treated in hospitals reached 2409.

Certain deaths were reported in 26 states and the District of Colombia.

And last month, officials announced the discovery of vitamin E acetate, believed to be used in illegal electronic smoking products containing marijuana, in all lung samples from 29 patients.

The Centers for Disease Control described vitamin E acetate or tocopherol acetate as a “chemical concern” and recommended that it not be added to e-cigarettes or e-smoking products, but investigations are continuing.