A study with around 30 years of data tracking some participants from birth to age 38 showed that heavy adolescent marijuana use permanently lowers IQ. Here is the article from Forbes with a link to the study: http://www.forbes.com/sites/travisb...tudy-shows-smoking-pot-permanently-lowers-iq/ An adolescent's brain is still developing, and cognitive skills have not yet been fully developed. (We all know as teenagers we were tempted to do "dumb things." This is because our frontal lobe which involves decision making is still developing!) It would make sense, then that any drug use during times of brain development could potentially limit one's mental capabilities. With a growing culture of people who see marijuana use as acceptable, do our teens today stand a chance? Is marijuana use worth the risk?