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Heavy smoke from hundreds of Canadian wildfires is drifting south across the border into the U.S., turning overcast skies yellow and brown and threatening the health of those breathing it. The Forget those occasional cigarettes: There is no safe smoking level The Boston Globe Secondhand smoke can travel through closed doors, vents and windows. Smoke can enter parts of your home from your neighbors in multi unit housing, exposing you to dangerous and toxic fumes. There is How Smoking Harms Your Child Smokefree

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