Not all cannabis users develop an addiction, even with long-term regular use, suggests a new study, which found that a shift from brain systems controlling reward-driven use to habit-driven use differentiates heavy cannabis users who are addicted to the drug from users who aren’t.

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Not all cannabis users develop an addiction, even with long-term regular use, suggests a new study, which found that a shift from brain systems controlling reward-driven use to habit-driven use differentiates heavy cannabis users who are addicted to the drug from users who aren’t.