Leading e-cigarette company Juul Labs has tried to distance itself from a vast social media presence that experts say drives its popularity among teens.

But a CNN investigation sheds new light on how the company was encouraging – and at times paying for – social media users to promote its nicotine-filled product to thousands of their followers.

For the last 10 years, Christina Zayas has made her living as a blogger and social media influencer. One of her recent jobs was posting positive content about e-cigarette products made by Juul.