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But as Fisher pointed out, this type of experimentation was doomed to produce meaningless results

Participants rated on a five-point Likert scale (from not at all effective to very effective) their opinions of the effectiveness of the cigarette packaging warnings in preventing non-smokers from smoking, and prompting current smokers to quit

Unique to this study, participants in both groups were also given the choice to choose their treatment, after the 18-week period

This is due to nicotine, which interferes with certain chemicals in your brain

When a person inhales cigarette smoke, carcinogens such as aromatic amines (notably 4-aminobiphenyl), polycyclic aromatic hydrocarbons (PAHs), and benzene enter the bloodstream