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"Snus products have a bit of a challenge" among smokers who are used to inhaling their nicotine, said Vaugh Rees, director of Harvard University's Center for Global Tobacco Control

For social or lighter smokers who have less need to wean themselves off nicotine, there are even nicotine-free e-liquids which can help satisfy the habit of smoking without introducing unneeded nicotine

With the blower door pressurizing the house, use a smoke pencil to check for air around windows

Under certain conditions, a rapid release near equipment may appear as a brief vapor cloud, but visible material from a room vent is more commonly condensation