953 patients (614 male, 339 female) with a mean age of 40.7 years from 32 countries completed the questionnaire. Most participants were from the USA, Germany, France, Canada, The Netherlands, Spain, and the UK. In 47.6% of all cases, cannabis products were prescribed or recommended by a physician, in 10.4% patients got their cannabinoid medication from a pharmacy, in 26.3% from a coffee shop or another unofficial or tolerated source. Preferred modes of use were smoking of cannabis (62.9%), inhalation of cannabis with a vaporizer (23.6%), oral use of cannabis in baked goods (7.9%), oral use of cannabis as a tea (2.4%) and oral use of Dronabinol/Marinol (1.8%). No significant differences in preferred modes of use were found in correlation to diseases, country or any other parameter. Results are not representative.
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(Source: Hazekamp A, Grotenhermen F, Abrams D, Russo E, Ware M, Navarrete-Varo R, Brenneisen R, Müller-Vahl K. The medicinal use of cannabis and cannabinoids: an international survey on methods of intake. Abstract, Cannabinoid Conference 2011, 8-10 September 2011, Bonn).