A recent New Scientist article ( I'm not a New Scientist spambot honestly) said that weed basically has two components, one of which is an anti-psychotic. Selection to produce ever stronger strains and skunk, have reduced or elimnated this anti-spychotic component, so modern strains are more likley to produce spychotic effects in the susceptible, than the weed of yesteryear.
It was posited as an argument for legalization so that the amount of the seconf component could be regulated.
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