Can a breathing app help tame opioid cravings?

This study tested whether a heart rate variability biofeedback program—using a sensor and smartphone app to guide slow breathing—is practical and helpful for adults in residential treatment for opioid use disorder. Thirty-two participants practiced daily for three weeks. Researchers measured how many people joined, stuck with it, and reported less stress or craving. The goal was to see if this low-cost technique could support recovery.