LOS ANGELES — Gov. Gavin Newsom of California announced on Monday that the state will ramp up its efforts to regulate electronic cigarettes — known as e-cigarettes or vapes — with new health-warning standards, a $20 million campaign to raise awareness about the products’ harmful health effects, and increased enforcement of counterfeit flavored products sold on the black market.

The move comes amid growing national concern over the dangers of electronic cigarettes, which heat liquids to produce an aerosol that is inhaled. The liquids often contain nicotine; some contain THC or CBD, which are derived from marijuana plants.

Nearly 400 cases of lung illnesses across 36 states have been linked to vaping, according to data issued last week by the Centers for Disease Control and Prevention. At least seven deaths have been linked to e-cigarette products in California, Illinois, Indiana, Kansas, Minnesota and Oregon.

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Political leaders at all levels of government have faced increased demands for action as the news of vaping-related illnesses has spread, and the federal government is considering a nationwide ban. But there is still little information about the cause of the illnesses. Government efforts to respond at the state and local level have been a patchwork effort, and it remains unclear how effective regulatory action will be.