Juul Labs CEO Kevin Burns issued a stark warning to nonsmokers about the company's vaping products.

"Don't vape. Don't use Juul," Juul CEO Kevin Burns told Tony Dokoupil in an interview that aired Thursday on "CBS This Morning."

"Don't start using nicotine if you don't have a preexisting relationship with nicotine," he said. "Don't use the product. You're not our target consumer."

Burns also said it was true that the long-term effects of vaping are unknown.

When asked how he could sell vaping products with no knowledge of the long-term effects, Burns said, "We think we have a product that is legal today, is tested for toxicity, and does not present, you know, a risk based on the guidelines of the category today to the American public."

In response to a question about whether Juul products are toxic, he said, "We do toxicology testing on all of our products."

Read more: Officials are investigating more than 200 cases of serious lung disease tied to vaping. Here are the other health risks you should know about.

Burns previously apologized to parents of kids addicted to the company's vaping products.

Juul is pushing a new checkout system to curb sales to minors

In an effort to curb sales of its products to minors, Juul on Wednesday said it planned to offer incentives to retailers to install a new electronic age-verification system at the point of sale, The Wall Street Journal reported.

Juul will stop selling to any retailer that hasn't adopted the system by May 2021, Burns told The Journal.

Read more: 'I go crazy if I don't have it': American teens are going wild over an addictive e-cigarette developed by Stanford graduates

The Food and Drug Administration has called teen vaping an "epidemic." Juul has been accused of marketing its dessert-flavored e-cigarettes on platforms popular among young people, including YouTube, Twitter, and Instagram.

Increased scrutiny of teen vaping has led some retailers, such as Rite Aid and Walmart, to pull the products from stores. Rite Aid stopped selling e-cigarettes altogether, while Walmart has stopped selling dessert-flavored vaping products.

Juul is partially owned by Altria, the tobacco giant behind Marlboro.