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Opiates : Covers both prescription painkillers and illicit drugs like heroin, with some tests distinguishing between different opioid classes

It must be stated though that price increases can be rather unpredictable as youth smoking behaviors are not as intense or consistent as adult smoking, while social sources are also a common way that adolescents obtain cigarettes

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Several factors might explain this: (1) the arithmetic tasks may have served as distractors reducing the effectiveness of the smoking cues, (2) the stressful version of the task might have elicited near maximal responses that were not further augmented by exposure to the smoking cues, (3) habituation to the video cues from baseline to phase 1 could not be ruled out, but this was considered unlikely as novel videos were presented at each session and the expected cue-induced responses re-emerged during the follow-up sessions