On May 7, Congressman Raja Krishnamoorthi of Illinois reintroduced his END ENDS Act—a federal bill that would cap e-cigarette nicotine levels at 20 milligrams per milliliter.

The intention was clear: The Ending Nicotine Dependence from Electronic Nicotine Delivery Systems Act—“END ENDS”—seeks to decrease the nicotine concentrations in vapes in order to make them less “addictive” and appealing to teenagers.