Does a lit cigarette produce only 3 toxic substances?, Yes, No, Which of the toxic substances in a lit cigarette causes addiction?, nicotine, carbon dioxide, carbon monoxide, tar, Which of the followings are the negative effects of tar? (You can choose more than one answer.), staining the fingernails and teeth, narrowing blood vessels, causing asthma, causing lung cancer, What is third-hand smoke?, the smoke breated out by a smoker, toxic substances from tobacco products that remain on the surroundings., the smoke from burning tobacco products, What are the negative effects of second-hand smoke? (You may choose more than one answer.), weakening children's reading ability, affecting the development of foetuses, causing repiratory diesease, causing middle ear infections, Which of the followings are the anti-smoking measures in Hong Kong? (You may choose more than one answer.), requirement for warning labels on cigarette packs, a total ban on ciagarettes, ban on selling cigarettes to people under tha age of 18, requirement for warning labels on cigarettes

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