Menthol cigarettes—cigarettes with added menthol for mint flavor—are actually more addictive than regular cigarettes. Why? Because the minty smell of menthol is itself addicting, and when added to cigarettes makes them even more so. Scientists have taken that idea, and reversed it, adding a stinky smell to cigarette smoke and having participants smell it while they sleep. Researchers found that study participants who were exposed to a mixture of cigarette smoke and rotten fish as they slept smoked significantly less than those who were in a control group and weren’t exposed to any smells. Further studies need to be done to bolster the findings, but sleep therapy combined with a stinky aromatherapy could be a new way to help smokers kick their noxious habit.