How long does nicotine stay in your system?

What is Nicotine? Nicotine, an alkaloid found in the leaves of tobacco plant, is an exceptionally addictive substance and is the active component of tobacco smoke. Tobacco leaves contain around two to seven percent nicotine. This substance imitates the effects of the neurotransmitter acetylcholine and largely affects the autonomic nervous system.� It can cause paralysis and respiratory failure even at doses below 50 mg. Biosynthesis of nicotine occurs in the roots and carried to the leaves for storage to help protect the plant from insects.� Five percent of tobacco plant?s dry weight is nicotine and depending on the cigarette brand, one stick may have eight to twenty milligrams of nicotine.� [...]

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