heroin binds to the neurotransmitter receptor and directly stimulates Refugio channels, nicotine and alcohol trigger a complex “chemical cascade which raises dopamine levels and there is also an unknown chemical in cigarettes that increases dopamine levels by blocking the enzyme MAO B.

Dopamine, as I mentioned, is more than one molecule of pleasure, also plays a special role in relation to learning and memory.

The extent to which learning and memory hold, so to speak, the addictive process is being studied. Each time a neurotransmitter such as dopamine reaches a synapse, circuits that trigger thoughts and motivation to action are fired and scattered throughout the brain. Furthermore, the neurotransmitter that keeps the addiction is so powerful that people, objects, situations and places where drugs are consumed in the memory. It has also shown that stimulated by the smell of snuff for smokers can not control the urge to light a cigarette and Pavlov’s dogs could not stop salivating.

The brain has several ways to ensure that the irrational act of taking drugs, which cause pleasure in being involved dopamine, will be repaired. PET images show that the absorption of cocaine by neurons is markedly reduced in the drug addicts in contrast with normal subjects. One possible explanation is the following: the neurons of addicts, “assaulted” by an abnormally high amount of dopamine and respond defensively and reduce the number of dopamine receptors. In the absence of drug experiments, these neurons probably a shortage of dopamine, which explains why addicts start taking drugs to feel better and then have to consume to avoid feeling caimiento and discomfort, as well as why an increasing need for substance to achieve the same effect.