'The marijuana-only smokers also had 8.2 milliliters more air exhaled after a full inhalation in comparison to non-smokers while tobacco-only smokers had 19 milliliters less. Researchers were surprised to find an increased airflow with increased exposure to marijuana up to a certain level. The results are surprising, because marijuana smoke contains similar noxious ingredients and chemicals as tobacco smoke, which is known to impair lung function.
Until now it has been unclear whether regular marijuana smoking led to the same injuries to the lungs. It was speculated by Dr. Keresz that the way pot is smoked (the common exercise of holding one's breath after inhaling cannabis smoke to increase its heady effects) might have some cause to people to doing well with the lung function test.
Pulmonologist, Dr. Donald Tashkin from the University of California also added that one reason marijuana smoke might not be as harmful as tobacco smoke, despite containing similar noxious ingredients, may be the fact that its active ingredient, THC, has anti-inflammatory effects. “We don’t know for sure,” he said, “but a very reasonable possibility is that THC may actually interfere with the development of chronic obstructive pulmonary disease.”'
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