Toronto Sun: 'The study, conducted by Harvard Medical School researchers and published in the journal JAMA Network Open, involved 269 adults in the Boston area seeking to obtain a medical marijuana card.
'The study randomly divided participants into two groups, one that obtained a card immediately and a placebo group that had told to wait 12 weeks before obtaining a medical marijuana card.
'Participants could choose their cannabis products, dose and frequency of use, and could continue to receive their usual medical or psychiatric care.
'Both groups were tracked over 12 weeks.
'The odds of developing cannabis use disorder (CUD) were immediately nearly two times higher in the medical marijuana card group than in the wait-list control group, according to the study.'