Did not see that illustration earlier but from China came ephedra, which would be the key component of meth. I don't know if you are around one of the areas where that stuff has taken hold but I'm a lifelong Oregonian and it is a big deal there. At first, people learned how to make it at home cheap. The crowd I hung out with back in the day (before meth) are almost all dead because of it, I think I disassociated myself from that lifestyle in the nick of time 30-some years ago. I have many acquaintances and even some family up there who are struggling with it, very sad. It is worse than heroin in my opinion. And recent legislation only transferred the supply from local to Mexico, I think it actually expanded the market.
There is a lot of money to be followed but one thing is certain - this misery is NOT caused by U.S. guns!