“…This is associated with heightened drug cravings, drug seeking and greater drug consumption in comparison with non-inhalant users (Borne et al 2005;Riegel et al 2007). Neuropsychological research suggests that inhalant users manifest poor working memory and abstract reasoning, poor visual-spatial recall and processing speed (Saddik et al 2005;Uzun & Kendirli 2005;Lubman et al 2008;Yücel et al 2008) Many of the existing inhalant abuse studies used retrospective designs (Howard et al 2008), analysed national or local population databases or reported individual case study findings (Wu & Howard 2007). Many inhalant abuse studies used smaller number of participants, did not compare cognitive or psychosocial functioning between inhalant and non-inhalant users, did not formally assess the interaction of drug use severity (the quantity and types of drugs used), and failed to mention that inhalant users are not a homogenous group, but the majority of inhalant users are also using other substances.…”