Substance Use Patterns and Behavioral Implications
Summary
Substance use across the lifespan exhibits marked variation in prevalence, modes of administration and potency, reflecting cultural, socioeconomic and regulatory influences. Initiation often occurs in adolescence, a sensitive neurodevelopmental period during which exposure to alcohol, nicotine, cannabis and other psychoactive substances can disrupt the maturation of executive control and reward pathways. Patterns of use range from experimental and recreational consumption to chronic, dependent use, with transitions influenced by individual vulnerability factors such as genetic predisposition, stress reactivity and peer context. High-potency products and novel delivery systems (for example vapourisers and concentrates) have emerged in recent years, intensifying both acute behavioural effects and longer-term risks. Behavioural implications include impaired cognitive function, heightened risk of mood and psychotic disorders, altered social engagement and increased likelihood of accidents or violence. Public health responses span universal prevention, targeted early-intervention and harm-reduction measures, emphasising the need for tailored strategies that reflect global diversity in substance availability, potency and patterns of use.
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Substance Use Patterns and Behavioral Implications publication trend
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Technical terms
High-potency cannabis: Cannabis products containing elevated levels of delta-9-tetrahydrocannabinol (THC), often defined as ≥10% THC.
Psychosis: A mental state characterised by impaired reality testing, including delusions and hallucinations.
Substance use disorder: A clinical condition marked by compulsive substance use despite adverse consequences.
Universal prevention programme: An intervention delivered to all individuals in a defined population, regardless of individual risk.
Mendelian randomisation: A genetic epidemiology method that uses inherited genetic variants as proxies for modifiable exposures to infer causal relationships.
Population attributable fraction: The proportion of cases of a disease in a population that can be ascribed to a specific exposure, assuming causality.
References
- Effectiveness of a universal, school-based, online programme for the prevention of anxiety, depression, and substance misuse among adolescents in Australia: 72-month outcomes from a cluster-randomised controlled trial. The Lancet Digital Health (2024).
- The contribution of cannabis use to variation in the incidence of psychotic disorder across Europe (EU-GEI): a multicentre case-control study. The Lancet Psychiatry (2019).
- Cannabis use and risk of schizophrenia: a Mendelian randomization study. Molecular Psychiatry (2017).
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