Passage Summary: Caffeine is just as addictive as other drugs, causes similar withdrawal issues, and is used by just as many people as those other drugs.

Reasoning: Caffeine is as physically addictive as other psychoactive substances, causes withdrawal symptoms, and has a user base equal in size to any other such substance.

Analysis: This stimulus sets up a comparison between caffeine and other psychoactive substances based on two metrics: the intensity of addiction and the number of users. Since the stimulus states that caffeine is 'as addictive' and has 'as many' users as any other single substance, we can logically conclude that the scale of potential addiction or withdrawal for caffeine is at least equal to that of any other drug mentioned. Look for an answer that synthesizes these two quantitative points without introducing outside concepts like health policy or social morality.