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Nicotine
Nicotine tricks your body to produce the Hormone Adrenaline or Neurotransmitters such as Dopamine or Serotonin which gives you the feel of a rush. For shorts periods of time your motivation is higher everything is more intense and you generaly feel better or “happy” in a way that is very addictive. This can easily lead to an psychological or in extreme cases even physiological dependency.