News tagged with nicotine
Related topics: smokers , smoking , smoking cessation , cigarettes , cigarette smoke
Nicotine is an alkaloid found in the nightshade family of plants (Solanaceae) which constitutes approximately 0.6–3.0% of dry weight of tobacco, with biosynthesis taking place in the roots, and accumulating in the leaves. It functions as an antiherbivore chemical with particular specificity to insects; therefore nicotine was widely used as an insecticide in the past, and currently nicotine analogs such as imidacloprid continue to be widely used.
In low concentrations (an average cigarette yields about 1 mg of absorbed nicotine), the substance acts as a stimulant in mammals and is one of the main factors responsible for the dependence-forming properties of tobacco smoking. According to the American Heart Association, "Nicotine addiction has historically been one of the hardest addictions to break." The pharmacological and behavioral characteristics that determine tobacco addiction are similar to those that determine addiction to drugs such as heroin and cocaine. Nicotine content in cigarettes has actually slowly increased over the years, and one study found that there was an average increase of 1.6% per year between the years of 1998 and 2005. This was found for all major market categories of cigarettes.
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Non-smokers should give hotels that allow smoking in certain rooms a wide berth, say the authors, and instead choose completely smoke free hotels.
Health May 13, 2013 | not rated yet | 0
Atomic-level characterization of the effects of alcohol on a major player of the central nervous system
Scientists at the Institut Pasteur, the CNRS and the University of Texas have been able to observe at atomic-level the effects of ethanol (the alcohol present in alcoholic beverages) on central nervous system receptors.
Medical research Apr 22, 2013 | not rated yet | 0