Why Are Researchers Particularly Concerned About the Effects of Heavy

Multiple Choice

Why are researchers particularly concerned about the effects of heavy marijuana smoking on the user, based on recent studies?

A) Daily use reduces the volume of the hippocampus and amygdala.
B) It causes memory deficits that persist at least a year after ceasing to smoke.
C) It causes major psychotic symptoms.
D) It produces cognitive deficits that are irreversible, regardless of length of use.