Even Juul Labs employees are having a tough time kicking their vaping habit.

Staffers at the San Francisco-based firm have continued to puff away at their desks and in meetings — even though Juul bosses have told them to cut it out and threatened punishment, the Wall Street Journal reported Monday.

The company has tried to snuff out the practice around the country to comply with local laws and lease agreements. But one employee reportedly said Juul’s workplace looks like something out of the TV show “Mad Men,” in which 1960s-era advertising honchos smoke cigarettes like chimneys.

“Just replace the cigarettes with e-cigarettes,” the employee told the Journal.

Juul first told staffers to stop vaping in the office in December 2018, after California and New York, where the company has offices, outlawed the use of e-cigarettes in workplaces. Then-CEO Kevin Burns pledged to install a tent at Juul’s San Francisco headquarters where workers could indulge outside, according to the Journal.

While staffers cut back a bit after the policy was imposed, some — including founders James Monsees and Adam Bowen — have continued to “openly” vape at work, and the tent was never set up, the Journal reported.

Burns reportedly outlined a series of penalties for office vaping in September amid complaints from employees — including one who was worried about the health effects of secondhand vapor.

The US Surgeon General has warned that vapor from e-cigarettes can possibly expose bystanders, as well as people who vape, to heavy metals and other dangerous substances.

Staffers would get a warning on the first offense, get their bonuses cut for the second and third violations, and possibly be fired for the fourth offense, according to the Journal.

“We remain committed to maintaining a smoke and vapor-free work-place in compliance with state and local laws,” a Juul spokesman said in a statement. “… We take this commitment very seriously and take appropriate actions against violations.”

Juul’s workplace vape problems come amid mounting health worries about e-cigarettes. In addition to the mysterious vaping-related lung disease that has sickened more than 2,500 people in the US, researchers have raised concerns about kids’ growing secondhand exposure to vape fumes containing heavy metals and other chemicals.

Those health concerns — as well as scrutiny of the company’s reported efforts to target youth — have caused Juul to flounder in recent months after skyrocketing to the top of a market for what was once considered a safer alternative to cancer-causing cigarettes.

Juul’s e-cigarette is the nation’s most popular, and the tobacco giant Altria valued the company at $38 billion when it purchased a 35 percent stake about a year ago.

But Juul started laying off about 650 employees last month amid a regulatory crackdown that has seen San Francisco ban e-cigarette sales entirely and New York City outlaw sales of flavored varieties. The job cuts followed Burns’s September departure as CEO.

Altria has written down its Juul investment by $4.5 billion, and Fidelity Investments recently slashed its valuation of the company to $16.4 billion, according to Bloomberg News.