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Considering sampling bias, this study involved a cross-sectional random sample survey with single-stage cluster sampling [24], wherein the school was set as the cluster unit

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You might be surprised to know some of the chemicals in tobacco smoke include: Arsenic used in pesticides Benzene important component in gasoline Formaldehyde used for embalming human remains and in nail polishes/hardeners Methanol a simple alcohol used in antifreeze, solvents and fuels Ammonia used in many commercial cleaning products How nicotine affects your brain The physical challenge of smoking is difficult because tobacco contains an addicting drug called nicotine