If it is 'intentional' it still could be sabotage.
A decade of no issues like this then suddenly a bunch at the same time the bigs are buying into vaping and the legal market for marijuana is growing. The blue ocean of vaping and marijuana is here, both the black market mafias/cartels and the big fish want it and to shakeout the small/medium suppliers you need an event like this. Not to mention the anti-smoking and cigarette lobbies in with the prohibitionists and presidential and governor executive orders, mere months after Altria buys into Juul (Dec 2018), very sketchy and suspect. Top it off it is a big target of propagandists and bot networks right now. Add all that up and it seems like a planned event after sabotage.
The bigs and the mafias/cartels can weather the storm, the small startups and small/medium businesses that have made safe products for over a decade are the target of attack.
In my opinion it was market sabotage on purpose. Every new blue ocean market has events like this and it is from various sources: big fish, underground mafias/cartels, prohibitionists, authoritarians, puritans and moral patrols.
This is America.
People not thinking it is about market power and money are naive as hell.
You think this is for health reasons? laughable. From the country that can't even get healthcare to everyone?
Same with all bans and prohibitions, makes it more unsafe and more lucrative for mafias/cartels because there is decreased supply and increased demand, price goes up, in comes the underground and big fish and more danger.