Sniffer dogs can accurately identify people with lung cancer even through, smoker, copd, They can smell volatile organic chemicals (VOCs) that are breathed out by the lungs. It is safe, affordable, accurate, non-invasive, and may someday be used by MDs to screen for cancers. One day thorugh the use of spectrophotometry it is promising that chemicals specific only to cancer will be discovered that make the diagnosis of cancer far easier.
