Smoking marijuana over the long-term can develop cancer and doubles the risk of developing schizophrenia, a new study has revealed. The 20-year research study conducted by Professor Wayne Hall, an adviser to the World Health Organisation (WHO), belies assumptions that cannabis has no negative side effects.

Long-term use of marijuana can cause cancer, bronchitis, and heart attacks reports Hall’s paper, published in the journal Addiction. Researchers also found that one in six teenagers and one in ten adults who regularly smoke cannabis become dependent on it. Teenagers who use the drug are also more likely to drop out of school and develop psychotic disorders and cognitive impairment.

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