"In 2011, 63% of the drug users reported cannabis as their primary drug when admitted to treatment for drug abuse. The opioids as a primary drug were reported by 17%, stimulants and cocaine by 15% and 6% reported 'other drugs' as the primary drug on admission. Quite a few drug abusers seeking treatment use several drugs, where 45% of the drug users reported having used more than one drug prior to admission in 2011.
"The stimulants which are particularly in focus of the young people's experimental use of drugs appears to a lesser degree as the primary drug for abusers admitted to treatment in 2011. 9% report amphetamine, 5% report cocaine, and 0.3% report ecstasy8 as their primary drug9. These drugs are thus mainly used as a supplement. Cannabis was the primary drug for 63% of those admitted to treatment and is also used as a secondary drug among 14% of those admitted to treatment in 2011."

Source

Sundhedsstyrelsen (National Board of Health), "2012 National Report (2011 data) to the EMCDDA by the Reitox National Focal Point: Denmark: New Development, Trends and in-depth information on selected issues," (Copenhagen, Denmark: Sundhedsstyrelsen, Nov. 2012), p. 37.
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