"Methamphetamine" is a powerful and highly addictive drug that affects a person's brain and body. It can cause increased energy, alertness, and euphoria, but it can also lead to serious health problems and addiction. Full definition
In the case reports / series, eight out of 10 strokes associated with the use of methamphetamine use among young people were haemorrhagic. (sciencedaily.com)
One large European study, for example — which examined sewage from 60 cities in 19 countries — discovered an acute use of methamphetamine in two eastern German cities (Chemnitz and Erfurt), heavy use of cocaine in Zurich and Barcelona, and a notable level of MDMA (ecstasy) use in Amsterdam, Kelly reports. (fortune.com)
There's also a concern of substance abuse, which might be playing a role — the epidemic of methamphetamine use, in particular. (scientificamerican.com)