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Information by substance

Introductory, sourced information cards on alcohol, nicotine, cannabis and stimulants: key concepts, research questions linked to mood, uncertainties and the role of professional support.

Who it is for
General readers, people close to them and students
Limits of this section
Contains no information on methods of use, dosage or personal quitting plans.

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Substance cards

Alcohol

Key concepts
Alcohol affects the central nervous system; effects vary with amount, pace, individual factors, medicines and context.
Research questions linked to mood
Research examines two-way links between patterns of use and sleep, anxiety and depressive symptoms; association alone does not establish cause.
Uncertainties
Short- and long-term effects, personal risks and co-occurring conditions differ; general information is not an individual risk calculation.
The role of professional support
Medical assessment matters when reducing or stopping may carry risk; abrupt cessation is not safe for everyone.
Content approval status
Beyaz approval · 18 October 2026

Nicotine

Key concepts
Nicotine can lead to dependence; products may expose people to toxic substances in addition to nicotine.
Research questions linked to mood
Mood, stress, withdrawal and short-term effects can overlap; perceived relief may partly reflect temporary relief from withdrawal.
Uncertainties
Products and patterns of use differ; observational links do not establish individual cause and effect.
The role of professional support
Cessation options and co-occurring health conditions can be discussed with a physician or appropriate health professional.
Content approval status
Beyaz approval · 18 October 2026

Cannabis

Key concepts
Cannabis products vary in content and potency; effects on attention, memory, perception and coordination differ by use and individual.
Research questions linked to mood
Research examines links with anxiety, depressive symptoms and psychosis; timing, dose, age and shared risks matter for interpretation.
Uncertainties
Product variability, combined substance use and self-report can complicate interpretation.
The role of professional support
Professional assessment may be appropriate when there are mental health symptoms, impaired functioning or difficulty stopping.
Content approval status
Beyaz approval · 18 October 2026

Stimulants

Key concepts
Stimulants include different substances; prescribed use is not the same as non-medical or illicit use.
Research questions linked to mood
Sleep loss, anxiety, activation, low mood and the period after use may interact; timing is important in assessment.
Uncertainties
Content, purity and dose may be unknown; general information cannot predict acute risk.
The role of professional support
Urgent medical care is needed for emergencies such as chest pain, severe agitation, altered consciousness or risk of self-harm.
Content approval status
Beyaz approval · 18 October 2026

General information, not diagnosis or personal advice.

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