New Study Reveals No Lung Damage From Casual Marijuana Smoking

"The study, which tracked and tested over 5,000 men and women for twenty years between 1985 and 2006, found that marijuana users who smoke an entire joint a day for seven years, or one joint a week for twenty years did not exhibit any decrease in lung function as measured by lung airflow and lung volume. And get this: casual 'pot' users actually exhibited a small, but statistically significant increase in lung function."