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INTRODUCTION Tobacco smoking is considered responsible for numerous serious human diseases, according to the World Health Organization (WHO), making it one of the main causes of preventable illness and mortality worldwide

By comparison, most conventional cigarette filters only partly filter the smoke from toxic substances

It works its way into porous surfaces (carpets, walls, fabrics, vents, and even the surface of wooden furniture), where it clings long after the visible smoke is gone

177) is the Theories of Change approach where theories are expressed in the form of causal relationships

In spaces that have poor ventilation with appliances and engines, carbon monoxide can accumulate to dangerous and poisonous levels