Just because something can be detected doesn't prove that it's a health hazard
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Light Scattering in Photoelectric Sensors Within a photoelectric alarm, an LED releases a light beam inside a dark chamber
The team used the Kessler Psychological Distress Scale, a six-item self-report assessment where participants reported on a 5-point scale the degree to which they experienced feelings or emotions like nervous, hopeless or so depressed that nothing could cheer them up. Scores are developed by summing points for the six experiences
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The turning point came on January 11, 1964, when Surgeon General Luther Terry convened a press conference at the State Department to announce what his advisory committee had found after reviewing more than 7,000 scientific articles: Cigarette smoking causes lung cancer and probably causes heart disease