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Some of the smokers began at age 15 or younger

Nevertheless, smoking cannabis regularly and long-term may be linked with some respiratory conditions, including: chronic bronchitis, which may result in a chronic cough or smokers cough increased risk of respiratory tract infections lung airflow obstruction hyperventilation emphysema asthma chronic obstructive pulmonary disorder (COPD) pneumonia Another possible lung complication from smoking cannabis is pneumothorax (collapsed lung), which can result from holding smoke in the lungs, a practice believed to increase the psychoactive effects of cannabis

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These signs have no health implications in themselvesjust like wrinkles, they are not harmful, says study author Janne S