vape men cartoon on chicago tribune (can't post link)

what is the author's purpose and what literary devices are used in this cartoon?
Allusion to mad men, but not sure why?
understatement - "it can't hurt if I don't know what in it" gets across the point of how people use vape and proportions are not known
dichotomy? not really sure how this is used?

Any other devices?

https://newsblogs.chicagotribune.com/taking-a-stantis/2014/04/vape-men.html

This one? Read the article and you may get some ideas.

Here's another article and some related ones linked inside it. And these are just a few.
https://www.click2houston.com/health/officials-discuss-3-houstonians-hospitalized-after-e-cigarette-use