teacher, teacher, teacher... oh hateful teacher... based on your comments, how do you feel about alcohol being legal? Surely it's proven that more deaths related to alcohol happen on the roads as compared to marijuana? The law is all screwed up and doesn't make much sense at all. If you are going to legalize alcohol then there is NO good reason why marijuana shouldn't be legal. Cigarette smoking is legal and that has way more harmful chemicals in it than marijuana. One last point: if you truly believe that obesity doesn't affect anyone but the person that is obese you are missing out on the bigger pictures. With such an obesity problem in this country it is a monster strain on the economy. Medical insurance rates would plummet if less people suffered from the myriad of health problems associated with obesity.
OH Daniel Daniel Daniel!!!! The whole picture well how about the 10 year olds who will very easily be able to get marijuana. cigarettes does not do what marijuana does to the brain. God you are some hypocrite!! You eat all this healthy censored but you you can drink and smoke marijuana and that is ok. Man your analogies are that of a 1st grader. You have nos ense of the overall picture. Marijuana affects the mind cigarettes destroy the human body. I hate cigarettes too. But at least they do not affect the way the mind works. Go eat some Tofu and have a 6 pack and bong hit. Now there is the hypocrite I know.
Teacher, Teacher, Teacher.......Please do your homework. Cigarettes most certainly have an effect on the nervous system.NicotineFrom Wikipedia, the free encyclopedia.Jump to: navigation, searchNicotine is also a file-sharing application for the Soulseek peer-to-peer network.Nicotine Chemical name (S)-3-(1-methylpyrrolidin-2-yl)pyridine Chemical formula C10H14N2 Molecular mass 162.23 g/mol Density 1.01 g/ml Melting point -79 °C Boiling point 247 °C CAS number 54-11-5 SMILES CN(CCC1)[C@@]1([H])C2=CC=CN=C2 Except where noted otherwise, data are given formaterials in their standard state (at 25 °C, 100 kPa)Infobox disclaimer and references Nicotine is an organic compound, an alkaloid found naturally in the nightshade family of plants, such as tobacco and tomatoes. It constitutes 0.3 to 5% of the tobacco plant by dry weight, with biosynthesis taking place in the roots, and accumulates in the leaves. It is a potent nerve poison and is included in many insecticides. In lower concentrations, the substance is a stimulant and is one of the main factors leading to the pleasure and habit-forming qualities of tobacco smoking. Nicotine has limited carcinogenic effects, inhibiting the body's ability to destroy potentially cancerous cells; however, nicotine does not promote the development of cancer in healthy cells. In addition to the tobacco plant, nicotine is also found in lower quantities in other members of the Solanaceae (nightshade) family, which includes tomato, potato, eggplant (aubergine), and green pepper. Nicotine alkaloids are also found in the leaves of the coca plant.Contents [hide]1 Chemistry 2 Effects on the body 3 Therapeutic uses 4 History and name 5 See also 6 External links ChemistryNicotine is a hygroscopic oily liquid that is miscible with water in its base form. As a nitrogenous base, nicotine forms salts with acids that are usually solid and water soluble. Nicotine easily penetrates the skin and forms vapors at elevated temperature.Effects on the bodyIn small doses nicotine has a stimulating effect, increasing activity, alertness and memory. Repeat users report a pleasant relaxing effect. It also increases the heart rate and blood pressure and reduces the appetite. In large doses it may cause vomiting and nausea. The LD50 of nicotine (that is, the lethal dosage reported to kill 50% of the population) is 50 mg/kg for rats and 3 mg/kg for mice. 40–60 mg can be a lethal dosage for adult human beings.Repeat users of nicotine very often develop a physical dependency to the chemical. A report released on May 16, 1988 by United States Surgeon General C. Everett Koop stated that the addictive properties of nicotine are similar to those of heroin and cocaine; although many people do not agree with such a comparison. Physical withdrawal symptoms include irritability, headaches, anxiety, cognitive disturbances and sleep disruption. These symptoms peak at around 48–72 hours, and generally cease after two to six weeks.Although the amount of nicotine inhaled with tobacco smoke is quite small (most of the substance is destroyed by the heat) it is still sufficient to cause dependence. The amount of nicotine absorbed by the body from smoking depends on many factors, including the type of tobacco, whether the smoke is inhaled, and whether a filter is used. For chewing tobacco,often called Dip, Snuff or snus which is held in the mouth between the lip and gum, the amount released into the body tends to be much greater than smoked tobacco.As nicotine enters the body, it quickly gets distributed through the bloodstream and can cross the blood-brain barrier. On average it takes about seven seconds for the substance to reach the brain. It acts on the nicotinic acetylcholine receptors. In small concentrations it increases the activity of these receptors, among other things leading to an increased flow of adrenaline, a stimulating hormone. The release of adrenaline causes an increase in heart rate, blood pressure and respiration, as well as higher glucose levels in the blood. Cotinine is a break-down product of nicotine which remains in the blood for up to 48 hours, and so can be used as an indicator of a person's exposure to smoke. In high doses, nicotine will cause a depolarizing block of the nicotinic acetylcholine receptor, which is the reason for its toxicity and its effectiveness as an insecticide.In addition, nicotine increases dopamine levels in the reward circuits of the brain. Studies have shown that smoking tobacco inhibits monoamine oxidase (MAO), an enzyme responsible for breaking down monoaminergic neurotransmitters such as dopamine, in the brain. It is currently believed that nicotine by itself does not inhibit the production of monoamine oxidase (MAO), but that other ingredients in inhaled tobacco smoke are believed to be responsible for this activity. In this way, it generates feelings of pleasure. This reaction is similar to that caused by cocaine and heroin, and is another reason people keep smoking: to sustain high dopamine levels.It has been noted that the majority of people diagnosed with schizophrenia smoke tobacco. Estimates for the number of schizophrenics that smoke range from 75% to 90%. It was recently argued that the increased level of smoking in schizophrenia may be due to a desire to self-medicate with nicotine.   More recent research has found the reverse, that it is a risk factor without long-term benefit, used only for its short term effects. Nicotine and its metabolites are being researched for the treatment of a number of disorders, including ADHD, Parkinson's Disease and Alzheimer's Disease.The carcinogenic properties of nicotine in standalone form, i.e. separate from tobacco smoke, have not been evaluated by the IARC, and it has not been assigned to an official carcinogen group. The currently available data indicates that nicotine on its own does not promote the development of cancer in healthy tissue, and has no mutagenic properties. Its teratogenic properties have not yet been adequately researched, and while the likelihood of birth defects caused by nicotine is believed to be very small or nonexistent, nicotine replacement product manufacturers recommend consultation with a physician before using a nicotine patch or nicotine gum while pregnant or nursing. However, nicotine and the increased acetylcholinic activity it causes have been shown to impede apoptosis, which is one of the means used by the body to destroy unwanted cells (programmed cell death). Since apoptosis helps remove mutated or damaged cells that may evolve into cancerous tissue, its inhibition by nicotine creates more favourable conditions for cancer to develop once the initial mutations have occurred. Thus, in combination with the numerous potent carcinogens in tobacco smoke, nicotine plays a role in carcinogenesis and may be considered to be a carcinogen on those grounds. It is also important to note that its addictive properties are often the primary motivating factor for tobacco smoking, contributing to the proliferation of cancer.History and nameNicotine is named after the tobacco plant Nicotiana tabacum which in turn is named after Jean Nicot, who sent tobacco seeds from Portugal to Paris in 1550 and promoted its medicinal use. It was first isolated in 1828 by German chemists Posselt & Reimann; its molecular formula (3-(1-methyl-2-pyrrolidinyl)pyridine) was established in 1843 by Adolf Pinner and it was first synthesized in 1904.See alsoPsychoactive drug Addiction