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20 year study finds Cannabis 'addictive and causes mental health problems

Health & Science

London: One in 10 users become addicted, according to the study by the World Health Organisation, and withdrawal is 'harder than heroin' it has been claimed.

Cannabis is 'addictive and can cause mental health problems', a 20-year study of the drug found.

Smoking dope is now as common as smoking tobacco among teens and young adults with its use having "grown tremendously" in the past 20 years.

However it is impossible to fatally overdose from it, the study confirmed.

World Health Organisation expert advisor on addiction Wayne Hall reviewed cannabis research since 1993 and set out the effects of cannabis use on mental and physical health.

Professor Hall, a professor of addiction policy at King’s College London, told the Mail Online: "If cannabis is not addictive then neither is heroin or alcohol.

"It is often harder to get people who are dependent on cannabis through withdrawal than for heroin – we just don’t know how to do it."

The findings found that the adverse effects of heavy cannabis use is the risk of developing a 'dependence syndrome'.

Around one in 10 of all cannabis users and one in six among those who start in adolescence do become addicted.

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