You are making a claim then saying you don't have to back it up while making another dubious claim.
Among synthetic opioid–involved overdose deaths in 2016, almost 80% involved another drug or alcohol, such as: another opioid, heroin, cocaine, prescription opioids, benzodiazepines, alcohol, psychostimulants, and antidepressants.
FWIW, 2016 is somewhat dated as far as fentanyl goes. It has really exploded since that time.
> In 2021, nearly 71,000 drug overdose deaths involving synthetic opioids (other than methadone) occurred in the United States, which is more deaths than from any other type of opioid. Synthetic opioid-involved death rates increased by over 22% from 2020 to 2021 and accounted for nearly 88% of all opioid-involved deaths in 2021. The number of overdose deaths involving synthetic opioids in 2021 was nearly 23 times the number in 2013.
What I posted wasn't about fentanyl. They implied that overdoses happen just as much with prescription pain killers that have consistent doses and what I posted shows that people aren't overdosing on known doses, they die when they combine drugs.
Among synthetic opioid–involved overdose deaths in 2016, almost 80% involved another drug or alcohol, such as: another opioid, heroin, cocaine, prescription opioids, benzodiazepines, alcohol, psychostimulants, and antidepressants.
https://www.cdc.gov/drugoverdose/deaths/other-drugs.html