THC levels in cannabis in Dutch coffee shops (Raymond Niesink, Sander Rigter – THC-concentraties in wiet, nederwiet en hasj in Nederlandse coffeeshops (2012-2013)). In the past year the THC average level went down (again) from 15,5% to 13,5%. One third has levels between 15 and 20 percent, Two thirds are below 15 percent.
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