Prescription Medications

Smoking Ups Flow of 'Feel Good' Brain Chemicals

This is the first time researchers have demonstrated that smoking increases levels of these brain chemicals -- called endogenous opioids -- which create a sense of reward, heighten positive emotions and help quell pain. These brain chemicals are also affected by morphine and heroin.

The results were presented Oct. 26 at the Society for Neuroscience annual meeting in San Diego.

This small pilot study, which included a group of young male pack-a-day smokers and a group of nonsmokers, found that smoking had a surprisingly large impact on levels of endogenous opioids. Brain scans were used to detect smoking-related changes in opioid levels.