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João Matias

Biographic Data

ID7354132
NAMEJoão Matias
GIVEN NAMESJoão
FAMILY NAMEMatias
SIGNATUREMATIAS J
AFFILIATIONSEuropean Monitoring Centre for Drugs and Drug Addiction
VERIFIEDNo
TOTAL WORKS15
TOTAL CITATIONS0
AUTHOR COUNT15
EDITOR COUNT0
FIRST PUBLICATION YEAR1995
LATEST PUBLICATION YEAR2025
H-INDEX0
  • Relationships Between Motives for Cannabis and Cannabidiol Use in People Who Co‐Use

    Open Access•Davide Fortin, Vincent Leroy et al.•ARTICLE•Drug and Alcohol Review•2025

  • Cannabis and Synthetic Cannabinoids Are Used for Different Reasons

    Open Access•Anna Péterfi, Róbert Urbán et al.•ARTICLE•International Journal of Mental…•2025

    Synthetic cannabinoids (SCs) first emerged in Europe during the 2000s, becoming widely accessible over the 2010s. Despite their known high health risks, little is understood about users’ motives for choosing SCs. The 2021 European Web Survey on Drugs (EWSD) reached 48,427 valid respondents from 22 European countries who use drugs. Motives of cannabis and synthetic cannabinoid use were compared while controlling for age and gender effects by logis…

  • Hexahydrocannabinol (HHC) use and harms in Ireland

    Open Access•Deirdre Mongan, Nicki Killeen et al.•ARTICLE•International Journal of Drug…•2025

    These data suggest that HHC has become a prominent feature of the Irish drug landscape. Given its harm potential, it will be important to monitor HHC use and related health harms

  • Evaluating the potential of wastewater-based epidemiology to estimate the retail illicit drug market size in Europe

    Open Access•Maarten Quireyns, Natan Van Wichelen et al.•ARTICLE•International Journal of Drug…•2025

  • Do Sex Differences and Risk Perception Affect Cannabis Exposure? Results from a Sample of Current Cannabis Users from the European Web Survey on Drugs

    Open Access•Valentina Lorenzetti, Eugene McTavish et al.•ARTICLE•International Journal of Mental…•2023

    The rates of cannabis use have been narrowing between sexes over the past decade, and there are sex differences in the perception of cannabis use-related risks, yet it remains unexamined whether sex and risk perception interact to predict cannabis consumption levels. We aimed to examine for the first time how sex, risk perception, and their interaction affect cannabis consumption, accounting for age, alcohol use, mode of administration, education…

  • Synthetic Cannabinoids and Cannabis

    Open Access•Hugo López-Pelayo, Santiago Madero et al.•ARTICLE•International Journal of Mental…•2022

  • Supporting Future Cannabis Policy – Developing a Standard Joint Unit

    Open Access•Hugo López-Pelayo, Silvia Matrai et al.•ARTICLE•Frontiers in Psychiatry•2021

    The standardization of cannabis doses is a priority for research, policy-making, clinical and harm-reduction interventions and consumer security. Scientists have called for standard units of dosing for cannabis, similar to those used for alcohol. A Standard Joint Unit (SJU) would facilitate preventive and intervention models in ways similar to the Standard Drink (SD). Learning from the SD experiences allows researchers to tackle emerging barriers…

  • Tell Me How Much Your Friends Consume”—Personal, Behavioral, Social, and Attitudinal Factors Associated with Alcohol and Cannabis Use among European School Students

    Open Access•Stefanie M Helmer, Gregor Burkhart et al.•ARTICLE•International Journal of…•2021

    Interventions addressing the perceived descriptive norms either directly or by changing environmental cues, opportunities, and regulations, as well as effective parenting and academic support may prevent and reduce risky substance use behavior among adolescents

  • Standard units for cannabis dose

    Open Access•Hugo López-Pelayo, Silvia Matrai et al.•ARTICLE•International Journal of Drug…•2021

  • Sources of drug acquisition among females and males in the European Web Survey on Drugs

    Open Access•M Vuolo, Joana Matias et al.•ARTICLE•International Journal of Drug…•2020

  • The use of multi-national web surveys for comparative analysis

    Open Access•Joana Matias, João Matias et al.•ARTICLE•International Journal of Drug…•2019

  • Surveying drug consumption

    Open Access•Kateřina Škařupová, Nicola Singleton et al.•ARTICLE•International Journal of Drug…•2019

  • Nine reasons why ecstasy is not quite what it used to be

    Open Access•Jane Mounteney, Paul Griffiths et al.•ARTICLE•International Journal of Drug…•2018

  • Atitudes face ao recovery na doença mental em utilizadores e profissionais de uma organização comunitária

    Open Access•Maria F Jorge-Monteiro, Fátima Jorge-Monteiro et al.•ARTICLE•Análise Psicológica•2012

    Em Portugal, a literatura bem como a investigação relativas ao recovery na doença mental é escassa. Este trabalho tem como principal objectivo o aferir das atitudes relativas ao recovery na doença mental em dois grupos distintos: pessoas com doença mental e profissionais de Saúde Mental numa organização comunitária. A amostra foi constituída por 30 elementos, 15 por cada um dos grupos atrás referidos. O instrumento utilizado foi o questionário, “…

  • Da Ação Cautelar Fiscal

    Open Access•Jo Ão Matias, João Matias•ARTICLE•Pensar - Revista de Ciências…•1995

No prominent works on this page.

  • Da Ação Cautelar Fiscal

    Open Access•Jo Ão Matias, João Matias•ARTICLE•Pensar - Revista de Ciências…•1995

  • Atitudes face ao recovery na doença mental em utilizadores e profissionais de uma organização comunitária

    Open Access•Maria F Jorge-Monteiro, Fátima Jorge-Monteiro et al.•ARTICLE•Análise Psicológica•2012

    Em Portugal, a literatura bem como a investigação relativas ao recovery na doença mental é escassa. Este trabalho tem como principal objectivo o aferir das atitudes relativas ao recovery na doença mental em dois grupos distintos: pessoas com doença mental e profissionais de Saúde Mental numa organização comunitária. A amostra foi constituída por 30 elementos, 15 por cada um dos grupos atrás referidos. O instrumento utilizado foi o questionário, “…

  • Nine reasons why ecstasy is not quite what it used to be

    Open Access•Jane Mounteney, Paul Griffiths et al.•ARTICLE•International Journal of Drug…•2018

  • The use of multi-national web surveys for comparative analysis

    Open Access•Joana Matias, João Matias et al.•ARTICLE•International Journal of Drug…•2019

  • Surveying drug consumption

    Open Access•Kateřina Škařupová, Nicola Singleton et al.•ARTICLE•International Journal of Drug…•2019

  • Sources of drug acquisition among females and males in the European Web Survey on Drugs

    Open Access•M Vuolo, Joana Matias et al.•ARTICLE•International Journal of Drug…•2020

  • Supporting Future Cannabis Policy – Developing a Standard Joint Unit

    Open Access•Hugo López-Pelayo, Silvia Matrai et al.•ARTICLE•Frontiers in Psychiatry•2021

    The standardization of cannabis doses is a priority for research, policy-making, clinical and harm-reduction interventions and consumer security. Scientists have called for standard units of dosing for cannabis, similar to those used for alcohol. A Standard Joint Unit (SJU) would facilitate preventive and intervention models in ways similar to the Standard Drink (SD). Learning from the SD experiences allows researchers to tackle emerging barriers…

  • Tell Me How Much Your Friends Consume”—Personal, Behavioral, Social, and Attitudinal Factors Associated with Alcohol and Cannabis Use among European School Students

    Open Access•Stefanie M Helmer, Gregor Burkhart et al.•ARTICLE•International Journal of…•2021

    Interventions addressing the perceived descriptive norms either directly or by changing environmental cues, opportunities, and regulations, as well as effective parenting and academic support may prevent and reduce risky substance use behavior among adolescents

  • Standard units for cannabis dose

    Open Access•Hugo López-Pelayo, Silvia Matrai et al.•ARTICLE•International Journal of Drug…•2021

  • Synthetic Cannabinoids and Cannabis

    Open Access•Hugo López-Pelayo, Santiago Madero et al.•ARTICLE•International Journal of Mental…•2022

  • Do Sex Differences and Risk Perception Affect Cannabis Exposure? Results from a Sample of Current Cannabis Users from the European Web Survey on Drugs

    Open Access•Valentina Lorenzetti, Eugene McTavish et al.•ARTICLE•International Journal of Mental…•2023

    The rates of cannabis use have been narrowing between sexes over the past decade, and there are sex differences in the perception of cannabis use-related risks, yet it remains unexamined whether sex and risk perception interact to predict cannabis consumption levels. We aimed to examine for the first time how sex, risk perception, and their interaction affect cannabis consumption, accounting for age, alcohol use, mode of administration, education…

  • Relationships Between Motives for Cannabis and Cannabidiol Use in People Who Co‐Use

    Open Access•Davide Fortin, Vincent Leroy et al.•ARTICLE•Drug and Alcohol Review•2025

  • Cannabis and Synthetic Cannabinoids Are Used for Different Reasons

    Open Access•Anna Péterfi, Róbert Urbán et al.•ARTICLE•International Journal of Mental…•2025

    Synthetic cannabinoids (SCs) first emerged in Europe during the 2000s, becoming widely accessible over the 2010s. Despite their known high health risks, little is understood about users’ motives for choosing SCs. The 2021 European Web Survey on Drugs (EWSD) reached 48,427 valid respondents from 22 European countries who use drugs. Motives of cannabis and synthetic cannabinoid use were compared while controlling for age and gender effects by logis…

  • Hexahydrocannabinol (HHC) use and harms in Ireland

    Open Access•Deirdre Mongan, Nicki Killeen et al.•ARTICLE•International Journal of Drug…•2025

    These data suggest that HHC has become a prominent feature of the Irish drug landscape. Given its harm potential, it will be important to monitor HHC use and related health harms

  • Evaluating the potential of wastewater-based epidemiology to estimate the retail illicit drug market size in Europe

    Open Access•Maarten Quireyns, Natan Van Wichelen et al.•ARTICLE•International Journal of Drug…•2025

Psychiatry (12 works) · Medicine (11 works) · Cannabis (10 works) · Cannabis and Cannabinoid Research (9 works) · Psychology (9 works) · Drug (5 works) · Environmental health (5 works) · HIV, Drug Use, Sexual Risk (5 works) · Substance Abuse Treatment and Outcomes (5 works) · Business (4 works)

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