All the cool kids are doing it. And that’s bad news for the nation’s top e-cigarette maker.

Facing lawsuits from parents of teenage vaping-product users and threats of crackdowns from regulators over kid-friendly packaging and flavors, Juul Labs has gone on a hiring spree on K Street, ramping up its lobbying spending fourfold in recent months. The San Francisco company that’s become synonymous with vaping — “juuling” is now a verb — has hired political hands in Washington and started a political action committee [...]