Teenagers who smoke cannabis weekly or more are twice as likely as non-users to have an anxiety disorder in their late 20s, even if they stop using, a study of 2000 Victorian teenagers has found. Those who used frequently in their teens and continued to use on a daily basis at the age of 29 were three times as likely to have an anxiety disorder compared with non- or infrequent users. Those who used minimally in their teens but became daily users in their late 20s were two and a half times as likely to have an anxiety disorder.
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