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Participants in four groups smoked joints with different ingredients, including placebos: cannabis with psychoactive levels of delta-9-tetrahydrocannabinol (THC) and tobacco with nicotine low THC, nonpsychoactive cannabis and tobacco with nicotine cannabis with psychoactive levels of THC and tobacco without nicotine low THC, nonpsychoactive cannabis and tobacco without nicotine In a memory recall test, the group who smoked active cannabis and tobacco found that tobacco reduced the high effect of cannabis on working memory

I suppose there was also a hidden lesson about smoking, and it might have worked, because I get queasy even thinking about all those cigars

A Grave Mistake

Brandon TH, Zelman DC, Baker TB