Peter Cohen's research while affiliated with University of Amsterdam and other places

Publications (9)

Article
Cocaine use was studied in Amsterdam among experienced users not drawn from biased populations of treatment clients, prison inmates, or prostitutes, but from the much larger pool of community based cocaine users. Cocaine use was studied in two samples, 160 in 1987 and 108 in 1991, recruited using snowball sampling techniques. Sixty-four of the 1987...
Article
I believe that the original aims of (almost full) prohibition of substance use, as it is applied according to the NY Single Convention of 1961, are unattainable. Instead, I want to present some arguments and ways of looking at drug use that support a far reaching revision of the current aims of drug control. Drug policy goals should shift, from sup...
Article
1 In deze voordracht wil ik iets vertellen over gebruikers van cannabis, dat wil zeggen hashish en marihuana, voornamelijk in Amsterdam. De nadruk valt op Amsterdam, niet omdat ik gebruikers daar belangrijker zou vinden dan elders, maar omdat er alleen over hen in Nederland relatief veel gegevens beschikbaar zijn. In 1987, in 1990 en in 1994 hebben...

Citations

... La relative faiblesse des conséquences sanitaires rapportées par les usagers rejoint les résultats des études conduites sur des populations similaires. En effet, toutes ces études convergent pour dire que les consommateurs cachés sont majoritairement des usagers contrôlés et occasionnels, et que seule une petite partie d'entre eux subit des dommages sanitaires de leur pratique (Erickson, Weber, 1994 ;Cohen, Sas, 1994, 1995, 1996Decorte, 2000). Dans l'étude de Hammersley et Ditton (1994), comme dans celle de Green et al. (1994), la survenue des conséquences sanitaires est bien corrélée au niveau d'usage et si les usagers les plus modérés ne connaissent aucun effet négatif, les usagers de crack et une partie des consommateurs par voie nasale peuvent connaître un sentiment de dépendance psychologique. ...
... Nevertheless, these respondents not necessarily represent the ones disposing the most qualitative data on the researched phenomenon. "Snowball", or chain-referral, data sampling method, first applied by Cohen (1989), was derived with a purpose to deal with the problems of sample access and to increase the sample size available to a researcher. The core of the method is asking known subjects (respondents) to nominate new subjects, who, in turn, nominate the other potential participants of the survey (Duncan et al., 2003;Vershinina, Rodionova, 2011). ...
... Whereas approximately 16 percent of youthful marijuana users in the U.S. have tried cocaine, the comparable figure for Dutch youth is 1.8 percent. 85 Indeed, Holland's policy of allowing marijuana to be purchased openly in government-regulated "coffee shops" was designed specifically to separate young marijuana users from illegal markets where heroin and cocaine are sold. 86 ...
... However, the dominant reductionist drugs discourse is based on inaccurate evaluations of drug-related harms (Nutt et al., 2010;van Amsterdam et al., 2015) and on overestimated interpretations of the complex relationships between drugs and crime (Stevens, 2007). Moreover, the majority of people who use drugs is functional, self-regulated, episodic and non-problematic users (Aldridge et al., 2011;Cohen, 1999;Cruz, 2015;Grund et al., 1993;Hart, 2013;Nicholson et al., 2002;Nutt, 2012;Percy, 2008;Schlag, 2020;Soar et al., 2006). While there are potential risks involved in drug use, the risks increase if a substance is prohibited by criminal statute (Buchanan, 2009;Buchanan, 2015;GCDP, 2015;GCDP, 2016;GCDP, 2017;Kerr et al., 2005;Lenton et al., 2000;Werb et al., 2011). ...
... The cannabis market has also attracted the attention of a range of Dutch scholars, who have studied consumption, the backgrounds of users and growers, and the crime problems associated with cannabis production and trafficking (Cf., Maalsté, 1995;Cohen & Sas, 1998Spapens et al., 2007;Maalsté & Panhuijsen, 2007;Spapens, 2008). Despite all the effort, there is little systematic and reliable data on the consumption of the different types of cannabis and particularly the amount of cannabis cultivated and imported into and exported from the Netherlands. ...
... La aportación de datos científicos en el proceso de formulación de políticas recibió menos atención porque, en este período de reconstrucción social y económica (después de dos guerras y una crisis económica mundiales), imperó el argumento de que el conocimiento científico era falible (De Ruyver 1988). Por ejemplo, la teoría de la escalada (Cohen y Sas 1997), que sostiene que las personas que consumen alcohol o marihuana probablemente consumirán drogas como la cocaína o la heroína, fue la base del marco fundamental en relación con las drogas. Aunque esta teoría fue por lo general rechazada por la comunidad científica debido a la falta de pruebas contundentes que respaldaran cualquier supuesta causalidad, logró obtener un apoyo considerable entre las personas responsables de las políticas, los medios de comunicación y la opinión pública (De Ruyver 1988, 2005. ...
... During IntA, cocaine is available intermittently, producing peaks and troughs in brain concentrations of the drug (Algallal et al. 2020;Allain et al. 2017a, b;Allain and Samaha 2019;Zimmer et al. 2012). This more closely models human patterns of cocaine use, which are thought to be intermittent, both between and within periods of use (Allain et al. 2015;Beveridge et al. 2012;Cohen and Sas 1994;Leri et al. 2004). ...