Several articles over the last 20 years have reported a correlation between cannabis smoking and apical emphysema with large bullae formation, specifically in younger patients 3,5,6 This phenomenon has been referred to as "marijuana lung"
Any of them, when burned, will reverse that process and thus, roughly speaking, for the same amount of energy produced will release the about the same amount of CO2
And it workeduntil it didnt
WHO Status Report on Tobacco Control
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Rectal intercourse transmission rates have not been quantified, but rectal intercourse appears to be an efficient mode of transmission