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19 Substance Use and Abuse Learning Objectives By the end of this section, you will be able to: Describe the diagnostic criteria for substance use disorders Identify the neurotransmitter systems affected by various categories of drugs Describe how different categories of drugs affect behavior and experience While we all experience altered states of consciousness in the form of sleep on a regular basis, some people use drugs and other substances that result in altered states of consciousness as well

Who has the moral and environmental high ground

Estimates of how many attempts it takes vary depending on how researchers count

These technologies need to be effectively combined in a cigarette design to prevent unintended increases in toxicant emissions

They appeared to have had a wonderful marriage, but Bacall had become the little woman: a devoted homebody who doesn't talk back -- who barely talks at all