Reports of “monkey dust” coming in from former industrial towns across the United Kingdom have residents terrified. Drug-crazed addicts eating shards of glass. People jumping off tall buildings. Superhuman “Hulks” overpowering police. These are allegedly the results of people high on “monkey dust,” a synthetic drug with effects similar to amphetamines that have become a scourge of small-town Britain. “I got into dust, monkey dust, lost everything, and now I’m on the floor,” said one addict, formerly employed as a plumber but now living in a tent. “I’m still taking dust. It’s all we do all day, rush around, try...