Juul's nicotine salts are dominating the market and other companies want in The Verge Juul Announces Preemptive Restrictions on Its E Cigarette Flavors Senators grill FDA regulators and Justice Department officials over rise of unauthorized e cigarettes PBS News FDA Delays Decision on Banning Juul Products FDA approves the sale of Juul vapes FDA bans all Juul e cigarettes in U.S.; lung association hails decision UPI.com