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

Sens. Barbara BoxerBarbara Levy BoxerFormer Democratic Sen. Barbara Boxer joins DC lobbying firm Hillicon 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 MORE (D-Calif.), Dick DurbinRichard (Dick) Joseph DurbinDemocrats introduce bill to reverse Trump's shift of military money toward wall Overnight Energy: EPA to regulate 'forever chemicals' in drinking water | Trump budget calls for slashing funds for climate science centers | House Dems urge banks not to fund drilling in Arctic refuge Democratic senators criticize plan that could expand Arctic oil and gas development MORE (D-Ill.), Richard Blumenthal (D-Conn.), Jack ReedJohn (Jack) Francis ReedOvernight Defense: Lawmakers tear into Pentagon over .8B for border wall | Dems offer bill to reverse Trump on wall funding | Senators urge UN to restore Iran sanctions Democrats introduce bill to reverse Trump's shift of military money toward wall Lawmakers wary as US on cusp of initial deal with Taliban MORE (D-R.I.), Sherrod Brown (D-Ohio) and Ed MarkeyEdward (Ed) John MarkeyKennedy, Markey neck-and-neck in Massachusetts primary: poll Overnight Energy: EPA to regulate 'forever chemicals' in drinking water | Trump budget calls for slashing funds for climate science centers | House Dems urge banks not to fund drilling in Arctic refuge Democratic senators criticize plan that could expand Arctic oil and gas development 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.