|Titre :||Potency trends of Delta9-tetrahydrocannabinol, cannabidiol and cannabinol in cannabis in the Netherlands: 2005-15 (2015)|
|Auteurs :||R. J. M. NIESINK ; S. RIGTER ; M. W. KOETER ; T. M. BRUNT|
|Type de document :||Article : Périodique|
|Dans :||Addiction (Vol.110, n°12, December 2015)|
|Article en page(s) :||1941-1950|
|Note générale :||
- Commentary: Interpreting trends in tetrahydrocannabinol potency - three stories, one of which may be true. Maccoun R.J., p. 1951-1952.
- Letter to the editor: Freeman T.P., Swift W. Cannabis potency: the need for global monitoring. Addiction, 2016;111(2), p. 376-377.
- Letter to the editor: Mammen G., de Freitas L., Rehm J., Rueda S. Cannabinoid concentrations in Canada's regulated medical cannabis industry. Addiction, 2017;112(4), p. 730-732.
|Discipline :||MAR (Marché de la drogue / Drug market)|
Thésaurus TOXIBASECANNABIS ; TETRAHYDROCANNABINOL ; CANNABINOIDES ; EVOLUTION ; COFFEE SHOP ; ANALYSE CHIMIQUE
Background and Aims: Between 2000 and 2005 the average percentage of Delta9-tetrahydrocannabinol (THC) in marijuana as sold in Dutch coffeeshops has increased substantially; the potency of domestic products (Nederwiet and Nederhasj) has particularly increased. In contrast with imported marijuana, Nederwiet hardly contained any cannabidiol (CBD), a cannabinoid that is thought to offset some of the adverse effects of THC. In 2005, the THC content in Nederwiet was significantly lower than in 2004. This study investigates the further decrease or increase of cannabinoids in these cannabis products.
Methods: From 2005 to 2015 five different cannabis products were bought anonymously in 50 coffeeshops that were selected randomly each year from all coffeeshops in the Netherlands. A total of 2126 cannabis samples were bought, consisting of 664 Nederwiet samples (most popular), 537 Nederwiet samples (supposed strongest varieties), 183 imported herbal cannabis samples, 140 samples of cannabis resin made of Nederwiet and 602 samples of imported cannabis resin. All samples were analysed chemically for their THC, CBD and cannabinol (CBN) content.
Results: Between 2005 and 2015, the mean potencies of the most popular and the strongest Nederwiet and of imported cannabis resin were 16.0 ± 4.0%, 17.0 ± 3,9% and 16.5 ± 6.3%, respectively. Imported herbal cannabis (6.5 ± 3.5%) and cannabis resin made from Nederwiet (30.2 ± 16.4%) contained, respectively, less (beta = -10.0, P Conclusion: The average tetrahydrocannabinol (THC) content of the most popular herbal cannabis products in the Netherlands has decreased slightly since 2005. The popular Nederwiet type still has a relatively high THC to cannabidiol ratio.
|Domaine :||Drogues illicites / Illicit drugs|
|Refs biblio. :||43|
|Affiliation :||Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands|