The WHO recommended limits are: 9-10 ppm for no more than 8 hours 25-35 ppm for no more than 1 hour 90-100 ppm for no more than 15 minutes UL, CSA, ANSI CO Levels Exposure Limits Underwriters Laboratories UL is the largest and best known independent, not-for-profit testing laboratory in the world
As a mild stimulant, caffeine can cause various physiological effects common to stimulants such as increased alertness and attention, improved mood, increased heart rate, and reduced appetite
online External links US Center for Disease Control - Smoking and Health Database Society for Research on Nicotine and Tobacco Archived August 15, 2019, at the Wayback Machine Bibliography on History of Cigarette Smoking
Like many countries, in Iceland, it is no longer legal to smoke inside any public buildings
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