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Summative/Cumulative/Final Task

in addition to fine pm, woodsmoke emissions contain components such as carbon monoxide (an asphyxiant), various irritant gases such as nitrogen dioxide, sulfur dioxide, hydrochloric acid, and aldehydes such as formaldehyde and acrolein, and chemicals known or suspected to be carcinogens, such as polycyclic aromatic hydrocarbons (pahs), oxygenated pahs, and polychlorinated dioxins and furans

The studys snus users in 1983 had an average 20 DFS, a statistically significant half of the 41 DFS in smokers and nonusers of tobacco

The defining feature is the ongoing, repeated pattern rather than an exact number of times.