Ending my love affair with Juul. Nic salts do actually have a similar throat hit, for much cheaper : r juul Canadian scientists exposed mice to vapour from JUUL e cigarettes and found it caused changes in the animals' pulmonary immune cell composition and altered gene and protein levels in their lungs. : r science Juul can continue to sell e cigarettes, FDA says Study: Juul Pods Contain Caffeine. What's It Doing There, And What Does It Do?