First I do agree there aren't going to be a lot of people selling this on the side (illegal dealing). If anything it will be people making some to sell to family and friends to cover their own costs of making juice. I don't see this as the next big organized crime market.
Now here is where I start to disagree. Just because some individual(s) are making liquid to sell illegally doesn't mean they are going to start putting random crap in it. Why would they waste money buying extra crap to put in it? Do you really think most current juice mixers really ran out and bought a lab to start their business? I would bet every last one of the name brands started out as a guy in his garage or a vape shop in house brand before they "got famous". Even today I doubt many if any are made in a lab by full fledged chemists beyond the stuff used by JUUL and other big name pod brands. The fact is you don't need a lab or a chemical engineering degree to MIX juice. It is precisely because it is so cheap and easy to do that makes DIY so worth while to anyone willing to do it. All someone would need to do to scale up from DIY to sales is more space, more ingredients, more bottles, and some extra people that can follow a simple recipe.
I'm not going to disagree that there could be conscientious "big joe" mixers. I've been making juice for over 5 years for myself and a very few select friends. I try to be very exact and clean when I mix. But I would not sell my juice to anyone and especially in the parking lot of a CS... lol. But I do think this will take us back to the days when shops made their own juice in the back room under suspect conditions and practices.
And yes there have been small manufacturers that started making juice themselves at home or whatever and scaled up to having their own lab or more commonly hired certified labs to make the juice for them to their specs to exacting standards and practices with verification of all components and QC reports to accompany the order. I can't think of a single well known brand that doesn't, but maybe there are some... dunno.
I just don't want to see this trend reverse with unknown and unknowable juice that could be problematic.
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