what are the harmful substances in tobacco Chemicals Cigarettes and Tobacco: What's Burning? Relative amounts of harmful substances

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The effectiveness depends on ventilation, surface type, and intensity of the smoke

Even there are people with belief that a person who works after his office hours is not a good manager for he failed to finish works in time

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The researchers called it thirdhand smoke. Unlike secondhand smoke, which lasts for only a short time after a cigarette is consumed, thirdhand smoke can linger in the environment by sticking to clothing, upholstery, walls and other surfaces

Respondents were asked to rate how frequently they experienced certain feelings over the past week, e.g