The multimedia device, known as iHeal, shows promise in using new technology to help addicts. This device uses a sensor, either put inside the wrist or on the ankle, that sends messages back to your smartphone, identifying times of stress and drug craving by identifying changes in biological and affective states.
The smartphone can then “intervene” , sending messages to the user to help prevent using when these changes occur. iHeal’s goal is to identify, in real time, drug cravings and deliver personalized multimedia drug prevention intervention precisely at the moment of greatest need. Read the whole article here, it is amazing. iHeal is still undergoing research and trials.