The effects of the recent explosion of Internet-based health information are little understood. Past research suggests that Internet information on drugs such as ecstasy and speed could increase knowledge of the drugs' potential danger while at the same time making attitudes towards them more accepting. To examine this question, a laboratory experiment was conducted in which participants were randomly assigned to search the Internet for information on "club drugs" or on an unrelated topic. Among those with no history of drug use, Internet searchers came to know more than nonsearchers about ecstasy and speed, and rated more highly the benefit of club drugs and their social disinhibiting effects. Among participants with a history of drug use, Internet searchers and nonsearchers showed fewer differences. The three main findings of this study were that searching increased knowledge, while normalizing risky behavior, but primarily for novices. This leads to the conclusion that people new to a health behavior may be most porous to new ideas presented on the Internet as they stabilize their mental model of the behavior.