Early Cannibis Use Lowers IQ

A new report reveals that young people risk lowered intelligence if they start smoking marijuana early in their teens.
Now there’s concrete evidence that young people risk lasting damage if they are frequent abusers of marijuana. A long-term study that followed 1000 New Zealanders from birth through age 38 found that those who started smoking marijuana in their teens lost an average of eight IQ points later in life.
http://news.narconon.org/warning-parents-marijuana-iq-damage/