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Strong increase in total delta-THC in cannabis preparations sold in Dutch coffee shops.
Addict Biol. 2005 Jun; 10(2):171-80.AB

Abstract

The total concentration of THC has been monitored in cannabis preparations sold in Dutch coffee shops since 1999. This annual monitoring was issued by the Ministry of Health after reports of increased potency. The level of the main psychoactive compound, Delta9-tetrahydrocannabinol (THC), is measured in marijuana and hashish. A comparison is made between imported and Dutch preparations, and between seasons. Samples of cannabis preparations from randomly selected coffee shops were analyzed using gas chromatography (GC-FID) for THC, CBD and CBN. In 2004, the average THC level of Dutch home-grown marijuana (Nederwiet) (20.4% THC) was significantly higher than that of imported marijuana (7.0% THC). Hashish derived from Dutch marijuana (Nederhasj) contained 39.3% THC in 2004, compared with 18.2% THC in imported hashish. The average THC percentage of Dutch marijuana, Dutch hashish and imported hashish was significantly higher than in previous years. It nearly doubled over 5 years. During this period, the THC percentage in imported marijuana remained unchanged. A higher price had to be paid for cannabis with higher levels of THC. Whether the increase in THC levels causes increased health risks for users can only be concluded when more data are available on adjusted patterns of use, abuse liability, bioavailability and levels of THC in the brain.

Authors+Show Affiliations

Trimbos Institute for Mental Health and Addiction, PO Box 725, 3500, AS Utrecht,The Netherlands. fpijlman@trimbos.nlNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

16191670

Citation

Pijlman, F T A., et al. "Strong Increase in Total delta-THC in Cannabis Preparations Sold in Dutch Coffee Shops." Addiction Biology, vol. 10, no. 2, 2005, pp. 171-80.
Pijlman FT, Rigter SM, Hoek J, et al. Strong increase in total delta-THC in cannabis preparations sold in Dutch coffee shops. Addict Biol. 2005;10(2):171-80.
Pijlman, F. T., Rigter, S. M., Hoek, J., Goldschmidt, H. M., & Niesink, R. J. (2005). Strong increase in total delta-THC in cannabis preparations sold in Dutch coffee shops. Addiction Biology, 10(2), 171-80.
Pijlman FT, et al. Strong Increase in Total delta-THC in Cannabis Preparations Sold in Dutch Coffee Shops. Addict Biol. 2005;10(2):171-80. PubMed PMID: 16191670.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Strong increase in total delta-THC in cannabis preparations sold in Dutch coffee shops. AU - Pijlman,F T A, AU - Rigter,S M, AU - Hoek,J, AU - Goldschmidt,H M J, AU - Niesink,R J M, PY - 2005/9/30/pubmed PY - 2005/11/3/medline PY - 2005/9/30/entrez SP - 171 EP - 80 JF - Addiction biology JO - Addict Biol VL - 10 IS - 2 N2 - The total concentration of THC has been monitored in cannabis preparations sold in Dutch coffee shops since 1999. This annual monitoring was issued by the Ministry of Health after reports of increased potency. The level of the main psychoactive compound, Delta9-tetrahydrocannabinol (THC), is measured in marijuana and hashish. A comparison is made between imported and Dutch preparations, and between seasons. Samples of cannabis preparations from randomly selected coffee shops were analyzed using gas chromatography (GC-FID) for THC, CBD and CBN. In 2004, the average THC level of Dutch home-grown marijuana (Nederwiet) (20.4% THC) was significantly higher than that of imported marijuana (7.0% THC). Hashish derived from Dutch marijuana (Nederhasj) contained 39.3% THC in 2004, compared with 18.2% THC in imported hashish. The average THC percentage of Dutch marijuana, Dutch hashish and imported hashish was significantly higher than in previous years. It nearly doubled over 5 years. During this period, the THC percentage in imported marijuana remained unchanged. A higher price had to be paid for cannabis with higher levels of THC. Whether the increase in THC levels causes increased health risks for users can only be concluded when more data are available on adjusted patterns of use, abuse liability, bioavailability and levels of THC in the brain. SN - 1355-6215 UR - https://www.unboundmedicine.com/medline/citation/16191670/Strong_increase_in_total_delta_THC_in_cannabis_preparations_sold_in_Dutch_coffee_shops_ L2 - https://doi.org/10.1080/13556210500123217 DB - PRIME DP - Unbound Medicine ER -