There are some unanswered questions about the long-term health safety of e-cigarettes. Studies have suggested that "vaping" is safer than smoking because it doesn't expose a person to the inhaled toxins found in cigarette smoke that can cause cancer. A recent study published in Mutation Research has furthered this thinking, showing that e-cigarettes do not cause mutation in DNA.
To the Editor: Holcomb B. Noble's article discussing the heavy burden of asthma faced by poor, largely minority children in New York City (News article, July 27, 1999) neglects to mention a prime trigger of children's asthma: cigarette smoke. Exposure to environmental tobacco smoke is known to increase severity of asthma symptoms, and to impair recovery following hospitalization of asthmatic children.