No smoke, no fire: What the initial literature suggests regarding vapourized cannabis and respiratory risk

As more municipalities relax restrictions on access to cannabis, questions about the plant’s potential for respiratory effects become more common. Given current limitations in developing an inhalant alternative for delivering cannabis medication, smoked marijuana remains the most readily accessible form of cannabis among medicinal users (1). An important question that remains is how to improve safety for the respiratory system in individuals who choose to use cannabis medicinally. Although frequent comparisons with tobacco emphasize that the smoke from cannabis has more carcinogens and respiratory irritants, the absence of nicotine likely mitigates the impact of some of these compounds (2). Evidence suggesting a link between cannabis and lung cancer is equivocal (24), but other concerns remain important. Frequent smokers of cannabis often report respiratory problems. Many users...

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URL: 
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4456813/