The result may have some people questioning the goodness of "all natural."
Christopher Wanjek is the author of the health books "Bad Medicine" and "Food At Work" and the novel "Hey, Einstein!" a comical nature-versus-nurture tale about raising clones of Albert Einstein in less-than-ideal settings. His column, Bad Medicine, appears regularly on LiveScience.
Casual to moderate use of marijuana has no negative implications for lungs, according to JAMA study.