The great lesson from the Facebook et al. debacle we are going through is that a technology that starts out benign and sometimes very useful (think Facebook in the first few years) can morph over time under economic and ideological pressures into something highly harmful to society at large (Facebook today). Second, the expertise developed due to a product existing can also be dangerous. Every technique created by the online-ad industry is now being used to derail democracy across the world.
Let's analyze Juul using the second point. Juul is an experiment modern technology is being leveraged to determine how quickly an addictive substance can be used to alter brain chemistry. The techniques learned from e-cigarettes (using data from tens of thousands of users) will in a few years be used for other hard drugs. Juul is turning a blind eye to kids using its products, but the drug mafias will actively pursue kids and get them hooked onto highly dangerous drugs using new high tech drug delivery devices. Yes, these devices already exist, but they are not being widely used and studied by scientists in methodical fashion, and published in journals.
Now the first point. Pretty soon, competitors will decide that the easy way to beat Juul is to make their own e-cigarette more addictive. From there, its going to be a rat race to the bottom where every company in the space will devolve to R&D labs trying to create the most addictive e-cigarette possible.
Do you really want to live in this future?