I kind of agree with the above, although less vehemently. No one was out to get you or the kid. You explained your situation, and you received responses. And no, not the kid's first mistake.
You know, a lot of us here vaping made our "first mistake" by "trying" tobacco, sometimes illegally.
I have made MY SHARE of errors in this world, and the one I would most take back would be smoking. While I am happy vaping is available as harm reduction, I would still prefer to be a never smoker with a never smoker's lungs.
No one here supports underage vaping, and neither should you, as a responsible adult. It's not the vape shop's fault, if the minor engaged in illegal acts to get successfully verified, which MAY well be what happened.
I'm sorry your "feelings" were hurt, but there are as yet still no long term vaping studies, so really, look at it more as "how can I handle this better than getting on the vape shop's case.
I promise, a homeless person or another student stands at the ready to enable your teen's addiction.. Tell the parents.
Anna