image Consuming at least one joint a day for 20 years has no negative effect on a person’s lung health, according to a comprehensive study[1] published earlier this year in the journal Annals of the American Thoracic Society, and published online by the National Institute of Health.

For the study, researchers at Emory University in Atlanta assessed a sample of US adults age 18 to 59 and examined their cannabis use and lung health. The sample consisted of those who participated in the National Health and Nutrition Examination Survey from 2007 to 2008 and from 2009 to 2010.

“In a large cross-section of U.S. adults, cumulative lifetime marijuana use, up to 20 joint-years, is not associated with adverse changes in spirometric measures of lung health”, says Dr. Jordan Kempker, the physician who led the study.

The full study can be found by clicking here[2].



  1. ^ a comprehensive study (
  2. ^ clicking here (

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