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Researchers compared college students who reported they had smoked marijuana at least fifteen days a month with similar students who said they smoked five days a month at most. A day after going without marijuana, the heavy users performed significantly worse on tasks that involved sustaining and shifting attention. The research design is
Blood Transfusions
A medical procedure involving the transfer of blood from a donor to a recipient to replace lost components of the blood.
Epidemiological Studies
Research investigations that study the distribution, patterns, and determinants of health and disease conditions in defined populations.
Animal Testing
The use of non-human animals in experiments and research studies, often for the purpose of understanding human diseases, testing pharmaceuticals, or assessing safety.
New Chemicals
Substances that have been recently developed or synthesized.
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