Availability is key though. Juul brand pods are simply the default, and for people on here we should know the power of sane defaults. Especially when we are talking underage users who are not really able to take advantage of the full market.

I did some googling and even promising links advertising no nicotine alternatives didn't even seem to have any in stock to order. Also noticed some disturbing trends with hiding the nicotine levels by mixing grams and percentage strengths and referring to it as "nic" which the skeptic in me says this is to divert attention from it being nicotine and people doing research on its addictive properties for those young enough not to know from anti-smoking campaigns.

Edit: Did a bit more digging and found some, but still likely harder to get if under 21.