• The CDC's investigation still has not identified any specific e-cigarette or vaping product or substance linked to all cases.

By the numbers, based on the latest information from 849 patients:

• About 78% reported using THC-containing products, with or without nicotine-containing products; 31% reported exclusive use of THC-containing products.
• About 70% of patients are male, about 80% of the patients are under 35 years old.

The impact: In September, Juul’s CEO resigned, as the company announced it would suspend all broadcast, print and digital advertising of its products in the U.S.

Meanwhile, individual states are cracking down on vaping products with a variety of proposals and bans. Massachusetts Gov. Charlie Baker declared a statewide public health emergency last month and called for a four-month ban on all vaping products, the harshest measure in the country so far.

• Los Angeles County also banned the sale of flavored tobacco products.
• The U.S. Army is also treating two active-duty soldiers in its medical facilities for vaping-related lung illness. Most of the military has banned e-cigarette sales at base exchanges, the Wall Street Journal reports.
• Schools across the country are also going after Juul with lawsuits, alleging the manufacturer put a major burden on institutions for wooing kids to vape their products, NPR reports.
• Juul has not been connected to the illnesses but owns a large portion of the e-cigarette market share.

The big picture: The CDC reported 1,479 confirmed and probable cases of severe respiratory illnesses as of Oct. 15 among those who vaped nicotine or cannabis products in 49 states, Washington, D.C., and 1 U.S. territory. Officials say that number is expected to continue rising.

Where it stands: The CDC maintains that no single e-cigarette product or compound has been linked to the pulmonary illnesses and there is no evidence that an infectious disease is the culprit.

• Among 1,357 patients with data on age and sex:
• 70% of patients are male.
• The median age of patients is 23, and the range spans from 13 to 75 years old.
• In New York, the first teenager died after being hospitalized twice in September with a vaping-related illness.
• In Massachusetts, the death of a woman in her 60s was reported on Oct. 7 as the state's first vaping-related death. The state currently has a 4-month ban on all vaping products, the harshest in the U.S.
• In Georgia, a patient with a history of heavy nicotine vaping, but no reported history of vaping THC, died, Georgia's Department of Health said.
• A Kansas man over age 50 with "underlying health conditions" died from a lung-related illness linked to vaping, according to Kansas Gov. Laura Kelly.
• A Missouri man in his mid-40s died from the illness, according to the state's Department of Health and Senior Services. The deceased in Kansas were both over 50 years old.

What they're saying: "This cluster of illnesses represents an emerging clinical syndrome" and points to a "worrisome" trend, physicians and health officials wrote on Sept. 6 in the New England Journal of Medicine.

• "It is possible that some of these cases were already occurring and we were not picking them up" prior to the agency's investigation into the illnesses, the director for the FDA Center for Tobacco Products, Mitch Zeller, said in August.

Of note: A woman filed the first wrongful death lawsuit against Juul in October, claiming the e-cigarette maker's nicotine cartridges were a significant factor in causing the death of her 18-year-old son over a year ago.

Go deeper: U.S. investigates fatality from vaping as lung-related illnesses rise