Kayla first tried fentanyl as a troubled 18-year-old, growing up in the US state of North Carolina.
"I felt like literally amazing. The voices in my head just completely went silent. I got instantly addicted," she remembers.
The little blue pills Kayla became hooked on were probably made in Mexico, and then smuggled across the border to the US - a deadly trade President Donald Trump is trying to crack down on.
But drug cartels aren't pharmacists. So, Kayla never knew how much fentanyl was in the pill she was taking. Would there be enough of the synthetic opioid to kill her?
"It's scary to think about that," Kayla says, reflecting on how she could have overdosed and died at any moment.
