Professor Wayne Hall destroys argument that cannabis is harmless

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  • One in six teenagers who regularly smoke the drug become dependent on it,
  • Cannabis doubles the risk of developing psychotic disorders, including schizophrenia,
  • Cannabis users do worse at school. Heavy use in adolescence appears to impair intellectual development
  • One in ten adults who regularly smoke the drug become dependent on it and those who use it are more likely to go on to use harder drugs,
  • Driving after smoking cannabis doubles the risk of a car crash, a risk which increases substantially if the driver has also had a drink,
  • Smoking it while pregnant reduces the baby’s birth weight.

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