Cannabis smoking and respiratory health: Consideration of the literature

@article{Gates2014CannabisSA,
  title={Cannabis smoking and respiratory health: Consideration of the literature},
  author={Peter J Gates and Adam Jaffe and Jan Copeland},
  journal={Respirology},
  year={2014},
  volume={19}
}
The respiratory health effects from tobacco smoking are well described. Cannabis smoke contains a similar profile of carcinogenic chemicals as tobacco smoke but is inhaled more deeply. Although cannabis smoke is known to contain similar harmful and carcinogenic substances to tobacco smoke, relatively little is understood regarding the respiratory health effects from cannabis smoking. There is a need to integrate research on cannabis and respiratory health effects so that gaps in the literature… 
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TLDR
The evidence that smoking cannabis leads to features of chronic obstructive pulmonary disease, such as airflow obstruction and emphysema is not convincing, however, there are numerous case reports of bullous emphySEma among cannabis smokers.
Effects of cannabis on pulmonary structure, function and symptoms
TLDR
Smoking cannabis was associated with a dose-related impairment of large airways function resulting in airflow obstruction and hyperinflation and the 1:2.5–5 dose equivalence between cannabis joints and tobacco cigarettes for adverse effects on lung function is of major public health significance.
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TLDR
The results suggest that the cannabis vaporizer is acceptable to users, and has the potential to decrease cannabis-related respiratory problems, and the device may increase awareness about respiratory health in cannabis users who also smoke cigarettes.
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TLDR
Significant respiratory symptoms and changes in spirometry occur in cannabis-dependent individuals at age 21 years, even although the cannabis smoking history is of relatively short duration.
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TLDR
Daily marijuana smoking, even in the absence of tobacco, appeared to be associated with an elevated risk of health care use for various health problems, and was adjusted for sex, age, race, education, marital status, and alcohol consumption.
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TLDR
There is unequivocal evidence that habitual or regular marijuana smoking is not harmless, and a caution against regular heavy marijuana usage is prudent.
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This paper summarizes the most probable of the adverse health effects of regular cannabis use sustained over years, as indicated by epidemiological studies that have established an association
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TLDR
Mainstream marijuana smoke contained selected polycyclic aromatic hydrocarbons at concentrations lower than those found in mainstream tobacco smoke, while the reverse was the case for sidestream smoke, with PAHs present at higher concentrations in marijuana smoke.
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TLDR
The impact of marijuana smoking on respiratory health has some significant similarities to that of tobacco smoking, and efforts to prevent and reduce marijuana use may have substantial public health benefits associated with decreased respiratory health problems.
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