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Memory-like effects in brain reward pathway could contribute to drug addiction. The effects of nicotine upon brain regions involved in addiction mirror those of cocaine, according to new neuroscience research. A single 15-minute exposure to nicotine caused a long-term increase in the excitability of neurons involved in reward, according to a study published in The Journal of Neuroscience.
Nicotine causes dopamine release in the brain. Now, nicotine is not that bad of and by itself, except it addicts you to it and a lot of pleasure symptoms go through dopamine release. Sugar release is dopamine, sex release is dopamine, heroin release is dopamine, and nicotine from cigarettes does too.