Cannabis use is linked to an increase in both manic and depressive symptoms in people with bipolar disorder, according to a new study by Lancaster University.

The study is the first to examine the use of cannabis in the context of daily life among people with bipolar disorder. In the U.K., where the study took place, around 2% of the population suffers from bipolar disorder, with up to 60% of those using cannabis at some point in their lives.

Research in this area is limited, however, and reasons for this high level of use are unclear.

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