Answer:
Dopamine.
Explanation:
Ethanol is a liposoluble neurotropic substance which penetrates the blood-brain barrier and inhibits Central Nervous System (CNS) functions, becoming toxic to the brain. Some of these neurotransmitters play an important role in the development of alcohol addiction. When it comes to the Reward Reinforcement Circuitry, Dopamine is the main neurotransmitter. Several studies support the relationship between alcohol intake and dopamine.
I don't think so but I'm not positive. I know my dad had exposure to secondhand smoke and he's fine. :) Hope this helps!
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