As the papal conclave continues, onlookers from around the world will watch for smoke in Vatican City, eager for the first update on who will be the next leader of the Catholic Church. On the morning ...

Is inhaling marijuana smoke safer than inhaling smoke from tobacco? A majority of American adults say yes, according to a new survey, and they also believe there is less harm to adults and children ...

Smoke from fires is an aerosol carried by violent updrafts to significant heights, containing particles, ash, and potentially contributing to cloud formation. Flying into active, nearby fire smoke is ...