"El tabaco no hace nada"
Nicotine exerts paradoxical effects, acting as both a stimulant and a relaxant. It causes increased heart rate and blood pressure while also acting as a muscle relaxant and reducing anxiety. It suppresses appetite and causes increased bowel activity. Initial exposure may result in nausea, dizziness, or light-headedness.
The experiential effects of nicotine change with habituation. Those new to the drug often experience light-headedness and strong mental effects where those who use nicotine regularly do not generally experience those effects. Over time, the effects of nicotine are not only calming but are said to enhance attentional focus and increase the pleasure of other activities. Research published in 2006 by Kenny and Markou suggested that nicotine "resets the sensitivity of reward systems to a new increased level, thereby impriting an indelible 'memory' of its effects". In other words, smoke a cigarette and eat an apple, the apple seems to be just a little more satisfying than the apple without the cigarette.
Nicotine may provide some beneficial effects on certain psychiatric conditions and has been preliminarily shown to slow onset of Parkinson's Disease symptoms. It's stimulating effects may be used by ADHD sufferers as a self-treatment, although its beneficial effects on attention disorders has not been established in the scientific literature. Nicotine tends to reduce appetite, even in regular users.
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