Taking cannabis regularly in your mid-20s can cause permanent damage to the brain and its legalization in some states has wrongly suggested to many that it is safe, the head of the National Institute on Drug Abuse (NIDA) has told DailyMail.com.
Dr Nora Volkow, who has led the agency for almost two decades, warned that cannabis use among young adults was a 'concern' and called for more 'urgent' research into the 'potential health risks' for the age group.
Health agencies in the U.S. have been warning for years there is a 'real risk' that cannabis can harm a person's mental development and their social life — including triggering problems with relationships, education and careers.
But their concerns have largely been swept under the carpet as many states push forward with legalizing the drug for recreational use.
In November another six states — Arkansas, Maryland, Nebraska, North and South Dakota and Oklahoma — are set to decide whether to also liberalize the drug's use.
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