Two more scientific studies corroborate earlier findings indicating that smoking cannabis damages one's lungs far more than does smoking tobacco.

One study found a higher risk of lung cancer for those who smoked one joint a day compared with those who smoked 20 cigarettes a day over the same period.

Another found bullous disease – a form of emphysema – occurs 20 years earlier in cannabis smokers.

The studies appear in Respirology and the European Respiratory Journal.

Cannabis use has been linked to serious physical and mental illnesses.

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