Explanation:
Haddock et al. (1998) stated that social factors are the strongest predictors of tobacco use; for example, having friends who smoke and view smoking as attractive significantly increases one's own risk of smoking.
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_________
The answer is A. Nitrous oxide.(laughing gas)
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A risk behavior is a behavior that carries some form of risk. In the case of teenagers and health risk this can include habits that can be particularly dangerous toward their and other now and future health. protected sex for example is a risky behavior which could cause STD infections.
Being knowledgeable about risk behaviors is a requirement in order to keep teens safe, and develop solutions to such dangers.