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. 2019 Jan 16;114(6):1015–1023. doi: 10.1111/add.14525

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© 2018 The Authors. Addiction published by John Wiley & Sons Ltd on behalf of Society for the Study of Addiction.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Changes in cannabis potency, price and value in Europe by year, 2006–16. Data shown are mean [± 95% confidence intervals (CIs)] observed values and are unadjusted for inflation. Red circles show expected price changes based on inflation alone. (a) Potency of cannabis resin, (b) potency of herbal cannabis, (c) price per gram of cannabis resin, (d) price per gram of herbal cannabis, (e) value of cannabis resin, (f) value of herbal cannabis. [Colour figure can be viewed at wileyonlinelibrary.com]