Cannabis is not, as widely perceived, a harmless drug but poses risks to the individual and to society.

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The findings show significant disturbance of EEG activity and deficits in visuospatial processing in young bipolar patients despite clinical euthymia. The abnormalities were not related to age of onset or duration of illness and do not appear to be attributable to medication. The cognitive impairments were associated with the number of previous affective episodes.