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"RAND study casts doubt on claims [[web.archive.org/web/20061104124529/http://www.rand.org/news/press.02/gateway.htmlبایگانیشده در ۲۷ نوامبر ۲۰۱۰ توسط Wayback Machine]]that marijuana acts as "gateway" to the use of cocaine and heroin". RAND Corporation. 2002-12-02. Archived from the original on 2006-11-04.
"RAND study casts doubt on claims that marijuana acts as "gateway" to the use of cocaine and heroin". RAND Corporation. 2002-12-02. Archived from the original on 2006-11-04.[۴][۵]
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"RAND study casts doubt on claims [[web.archive.org/web/20061104124529/http://www.rand.org/news/press.02/gateway.htmlبایگانیشده در ۲۷ نوامبر ۲۰۱۰ توسط Wayback Machine]]that marijuana acts as "gateway" to the use of cocaine and heroin". RAND Corporation. 2002-12-02. Archived from the original on 2006-11-04.
[۲] Australian Government Department of Health: National Cannabis Strategy Consultation Paper, p. 4. "Cannabis has been described as a 'Trojan Horse' for nicotine addiction, given the usual method of mixing Cannabis with tobacco when preparing marijuana for administration."
Saitz, Richard (2003-02-18). "Is marijuana a gateway drug?". Journal Watch 2003 (218)aaبایگانیشده در ۲۰ ژانویه ۲۰۱۳ توسط Wayback Machine
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"RAND study casts doubt on claims that marijuana acts as "gateway" to the use of cocaine and heroin". RAND Corporation. 2002-12-02. Archived from the original on 2006-11-04.[۴][۵]