NewsScan #64 includes summaries of eight NIDA-funded scientific studies on a variety of topics, including brain imaging of sensation-seeking individuals, the role of glial cells in morphine’s effects in the brain, awareness deficits among marijuana abusers, the effects of two drugs on reducing opioid withdrawal symptoms, the behavioral effects of salvinorin A in non-human primates, drug abuse risk factors for traumatic brain injury survivors, use of marijuana among those with a subtype of testicular cancer, and environmental cues associated with nicotine.