Fentanyl is a problem because Purdue Pharmaceutical got a ton of people addicted to Oxycontin and then the government suddenly shut the faucet off making the problem almost instantly worse. There was not enough heroin to supply the US addiction needs So it was "fortified" with fentanyl. It soon became clear how much cheaper it was and the profit and ease of transportation. China may use it as a 'weapon' but they don't have to. Mexico, the middle east, criminals and psychopaths the world over just for greed of money and power would do it. Our own CIA directly sold cocaine and started the crack epidemic in this country. China became a problem because businesses were more than happy to exploit workers and slaves all over for greater profit at the cost of their own countries and people. Fentanyl is here and not going anywhere anytime soon, even if China made none of it. We have a huge market for drugs here and it will always be filled by greedy people.