Senate Democrats urged the Food and Drug Administration (FDA) to require stronger warning labels for e-cigarettes.

Sens. Barbara BoxerBarbara Levy BoxerHillicon Valley: Ocasio-Cortez clashes with former Dem senator over gig worker bill | Software engineer indicted over Capital One breach | Lawmakers push Amazon to remove unsafe products Ocasio-Cortez blasts former Dem senator for helping Lyft fight gig worker bill Only four Dem senators have endorsed 2020 candidates MORE (D-Calif.), Dick DurbinRichard (Dick) Joseph DurbinA national interest rate cap would harm consumers in the name of consumers Senate committee approves 0 million for state election security efforts GOP's Kennedy sends warning shot to Trump nominee Menashi MORE (D-Ill.), Richard Blumenthal (D-Conn.), Jack ReedJohn (Jack) Francis ReedNegotiators kick off defense bill talks amid border wall, Iran debates Hillicon Valley: Zuckerberg to meet with lawmakers | Big tech defends efforts against online extremism | Trump attends secretive Silicon Valley fundraiser | Omar urges Twitter to take action against Trump tweet Senate Democrats introduce legislation to limit foreign interference in elections MORE (D-R.I.), Sherrod Brown (D-Ohio) and Ed MarkeyEdward (Ed) John MarkeySanders defends job losses from ending use of fossil fuels The Hill's Morning Report - Pompeo condemns Iran for 'act of war' while Trump moves with caution Defense bill talks set to start amid wall fight MORE (D-Mass.) wrote to FDA Commissioner Margaret Hamburg Thursday asking her to finalize proposed rules to expand the agencies ability to regulate all nicotine products.

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The senators wrote that because of a lack of federal regulations, e-cigarette companies are producing their own warning labels that fail to list all of the health threats. They said the pending FDA proposal warning also wouldn’t go far enough.

“In FDA's proposed 'deeming regulation,' the agency includes a warning label for e-cigarettes that does not adequately warn consumers on the known dangers of nicotine use. The proposed label reads 'WARNING: This product contains nicotine derived from tobacco. Nicotine is an addictive chemical,'” the letter stated. “We support requiring a label on nicotine's addictive properties, but we ask the FDA pursue requirements for more extensive warnings that address health risks that e-cigarettes pose.”

More lawmakers have grown concerned over e-cigarette use as nicotine poisoning incidents rise.

The Democratic senators have also introduced the Protecting Children from Electronic Cigarette Advertising Act, which would ban marketing e-cigarettes to minors.