Butter-scented chemical linked to "popcorn lung" (bronchiolitis obliterans) discovered in vape juices, and is the most common flavoring chemical in e-liquids. In the new study, the chemical, together with another similar one, was found to impair the function of the lungs when inhaled.

See the source article by following the link below:
Butter-scented chemical linked to "popcorn lung" (bronchiolitis obliterans) discovered in vape juices, and is the most common flavoring chemical in e-liquids. In the new study, the chemical, together with another similar one, was found to impair the function of the lungs when inhaled.