A problematic pattern of tobacco use leading to clinically significant impairment or distress.
Unobtrusive Heroin User
A long-term heroin user who has never been in specialized treatment and who displays levels of occupational status and educational achievement similar to the general population.
The need for increased amounts of a substance in order to achieve similar effects across time.
Where the body requires the drug in order to maintain physical stability, and lack of the drug causes a range of negative and aversive physical consequences (e.g. anxiety, tremors and, in extreme cases, death).
Ventral Tegmental Area (VTA)
Part of the midbrain associated with the dopamine system.
Substance Use Disorder (SUD)
Where an individual has at least one substance disorder diagnosis, whether it is a general diagnosis of substance dependency or abuse, or a more specific substance category disorder.