Four groups of 10 subjects each, representing different levels of marijuana usage, performed two different psychomotor tasks. One group had never smoked marijuana; one group had smoked marijuana previously but had stopped. The other two groups consisted of habitual smokers of marijuana – one smoked a placebo, and the other smoked marijuana just prior to performing the psychomotor tasks. Consistent patterns of inferior performance were found for the marijuana users on both manipulative and coordination skills.
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