Which of the following substances is classified under moderate/high dependence potential?

Tobacco cigarettes are classified under moderate/high dependence potential due to the presence of nicotine, which is a highly addictive substance. Users often find themselves developing a strong psychological and physical dependence on nicotine, leading to significant withdrawal symptoms when they attempt to quit. This dependence is characterized by a strong craving for the substance, increased tolerance, and often, relapse after attempts to stop using.

In comparison, while substances like PCP and dextroamphetamine can lead to dependence, their patterns of use and potential for addiction may vary significantly. PCP is known for its hallucinogenic effects rather than typical patterns of dependence. Dextroamphetamine can also lead to dependence but is often prescribed in controlled doses and monitored for therapeutic use. Caffeine, although widely consumed, typically has a lower potential for dependence and milder withdrawal symptoms compared to nicotine. Thus, tobacco cigarettes are accurately categorized as having moderate to high dependence potential due to the addictive nature of nicotine and the behavioral aspects involved in tobacco use.