The fact that its addictive and damages people. That should be the illegal thing: using a factory to make things that people get addicted to and it harms them.
People 1000 years from now are going to look at us in the way we look at witch trials. Likt wtf bro? Why don't you go making bombs that get set off on a hair trigger and just lay them around? They only hurt once in a while if you get them close to your face.
Wtf really? Well you see, it was addictive! And... We really liked it! mmm hmmm. I can think of better defenses for the witch trials.