Consider this statistic: 33,000 people died from opioid overdoses in 2015 . This number included a 72 percent increase in deaths that resulted from synthetic opioids like fentanyl. Fentanyl is similar to morphine except that it is 50 to 100 times more potent. They are customarily used to manage otherwise unmanageable pain and post surgically in those who are intolerant to other opioids.
Typically non-prescription illegal fentanyl sold on the street and gets mixed with heroin or cocaine which can be a lethal combination.
Your kids may be pushing the envelope. Be observant, informed and engage them in discussions about all drugs. They are probably being sold every day at your kids school.