Changes in cannabis potency and first-time admissions to drug treatment: a 16-year study in the Netherlands

The number of people entering specialist drug treatment for cannabis problems has increased considerably in recent years. The reasons for this are unclear, but rising cannabis potency could be a contributing factor. Cannabis potency data were obtained from an ongoing monitoring programme in the Neth...

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Published in:Psychological medicine 2018-10, Vol.48 (14), p.2346-2352
Main Authors: Freeman, Tom P., van der Pol, Peggy, Kuijpers, Wil, Wisselink, Jeroen, Das, Ravi K., Rigter, Sander, van Laar, Margriet, Griffiths, Paul, Swift, Wendy, Niesink, Raymond, Lynskey, Michael T.
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Cannabis
Change agents
Coffee
Drug abuse
Marijuana
Original Articles
Patient admissions
Regression analysis
Statistical analysis
Studies
Substance abuse treatment
Tetrahydrocannabinol
Trends
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creator Freeman, Tom P.
van der Pol, Peggy
Kuijpers, Wil
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Swift, Wendy
Niesink, Raymond
Lynskey, Michael T.
description The number of people entering specialist drug treatment for cannabis problems has increased considerably in recent years. The reasons for this are unclear, but rising cannabis potency could be a contributing factor. Cannabis potency data were obtained from an ongoing monitoring programme in the Netherlands. We analysed concentrations of δ-9-tetrahydrocannabinol (THC) from the most popular variety of domestic herbal cannabis sold in each retail outlet (2000-2015). Mixed effects linear regression models examined time-dependent associations between THC and first-time cannabis admissions to specialist drug treatment. Candidate time lags were 0-10 years, based on normative European drug treatment data. THC increased from a mean (95% CI) of 8.62 (7.97-9.27) to 20.38 (19.09-21.67) from 2000 to 2004 and then decreased to 15.31 (14.24-16.38) in 2015. First-time cannabis admissions (per 100 000 inhabitants) rose from 7.08 to 26.36 from 2000 to 2010, and then decreased to 19.82 in 2015. THC was positively associated with treatment entry at lags of 0-9 years, with the strongest association at 5 years, b = 0.370 (0.317-0.424), p < 0.0001. After adjusting for age, sex and non-cannabis drug treatment admissions, these positive associations were attenuated but remained statistically significant at lags of 5-7 years and were again strongest at 5 years, b = 0.082 (0.052-0.111), p < 0.0001. In this 16-year observational study, we found positive time-dependent associations between changes in cannabis potency and first-time cannabis admissions to drug treatment. These associations are biologically plausible, but their strength after adjustment suggests that other factors are also important.
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source Applied Social Sciences Index & Abstracts (ASSIA); Cambridge Journals Online; Social Science Premium Collection (Proquest) (PQ_SDU_P3); Sociology Collection
subjects Cannabis
Change agents
Coffee
Drug abuse
Marijuana
Original Articles
Patient admissions
Regression analysis
Statistical analysis
Studies
Substance abuse treatment
Tetrahydrocannabinol
Trends
title Changes in cannabis potency and first-time admissions to drug treatment: a 16-year study in the Netherlands
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