Fentanyl and Overdose. Fentanyl and other synthetic opioids are the most common drugs involved in overdose deaths. 1 Even in small doses, it can be deadly. Over 150 people die every day from overdoses related to synthetic opioids like fentanyl. 2. Drugs may contain deadly levels of fentanyl, and you wouldn’t be able to see it, taste it, or smell it.
https://www.cdc.gov/stopoverdose/fentanyl/index.html