Individual states have taken steps to address the U.S. vaping crisis as federal agencies continue to investigate the mysterious lung injuries that have killed 33 people and hospitalized 1,479.

E-cigarette maker Juul announced Thursday it's suspending sales of all non-tobacco and non-menthol-based e-cigarette flavors, five weeks after the Trump administration proposed a ban on the products.

The number of deaths linked to vaping-related lung injury has soared to 26, and the number of confirmed and probable cases has risen to 1,299 reported in 49 states, the District of Columbia and the U.S. Virgin Islands.

The Federal Trade Commission opened an inquiry Thursday into the marketing practices of six e-cigarette manufacturers.

Twelve people have died and the number of confirmed and probable cases of lung disease linked to vaping use has risen to 805, the Centers for Disease Control and Prevention reported Thursday.

Electronic cigarette maker Altria announced Wednesday it will suspend marketing products in the United States, and promised to comply with proposed federal policy to remove flavored vaping products from the market.

The CDC has counted at least 530 cases of e-cigarette-linked lung illnesses in the last several weeks, and the FDA has collected more than 150 vapor cartridge products for testing.

The CDC on Thursday revised downward the number vaping-linked lung illnesses to 380, from 450, counting only confirmed and probable cases in order to more accurately understand the number of people affected.

The U.S. Food and Drug Administration has sent two warning letters to JUUL Labs in reference to the e-cigarette giant's marketing practices, based on alleged outreach efforts to adolescents and teens.

Major U.S. tobacco companies Philip Morris International and Altria, former business partners which split more than a decade ago, said Tuesday they are considering a reunion.

Researchers found that teens who recalled seeing in-store marketing were twice as likely to start vaping over the next couple years.

Protesters of teen vaping began to march Tuesday outside JUUL offices in New York City, days after a U.S. government agency announced it was looking into lung illnesses possibly associated with the practice.

The Food and Drug Administration on Thursday ordered four companies to halt sales of flavored e-cigarettes and hookah tobacco products.

While people who vape are inhaling chemicals used in the products, researchers point out they also inhale the results of reactions between those chemicals -- which may have unknown effects.

A House subcommittee has accused Juul Labs of deliberately targeting children as young as eight in its push to become the nation's leading e-cigarette maker.