Donald Trump’s new trade war with China is also an opioid war 

More than six years after Donald Trump, then in his first term as America’s president, mounted a trade war against China, the guns are firing again. On February 4th Mr Trump imposed an additional 10% tariff on imports from China, which responded with a slew of its own on various American products. Canada and Mexico, which had also been threatened with tariffs, gained at least a temporary reprieve. But even if China eventually gets a similar concession, the drugs that Mr Trump cites as the reason for his latest actions—synthetic…