吗啡类的药是美国药物过量致死主要原因，其中芬太尼又是吗啡类致死的主要药物，占近2/3。

Drug overdose deaths top 100,000 annually for the first time, driven by fentanyl, CDC data show

Opioids continue to be the driving cause of drug overdose deaths. Synthetic opioids, primarily fentanyl, caused nearly two-thirds (64%) of all drug overdose deaths in the 12-month period ending April 2021, up 49% from the year before, the CDC's 's National Center for Health Statistics found.

https://amp.cnn.com/cnn/2021/11/17/health/drug-overdose-deaths-record-high/index.html