They can you fucking retard. How do you think vapes began? Around 2008 or so companies realized they could sell "portable nebulizers" as medical equipment and "nebulizer juice" as a herbal supplement without taxes, customs checks, or even ID requirements. Which is how vaping went mainstream because suddenly 13 year olds like myself could get free smokes off the internet.
Anyway, it's how old people with breathing problems get oxygen and abuertrol. More info here:
https://www.medicare.gov/coverage/nebulizers-nebulizer-medicationshttps://medlineplus.gov/ency/patientinstructions/000006.htmhttps://emsa.ca.gov/wp-content/uploads/sites/71/2017/07/nebulizer_stuff.pdfMost of the unregulated stuff ended in 2014 when portable vapes and vape juice were reclassified as cigarettes with nebulizer/nebulizer medicine sales being more strictly controlled now too.