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Name of the dopamine system involved in addiction

What is different about the dopamine system in people vulnerable to addiction?

What is the gene that makes people less likely to smoke?

A more sensitive ??? leads to over-production of dopamine

How are genetics studied?

The "non-smoking gene" can be applied to...

"Physical Dependence" can be applied to...

Shachter's "low-nicotine vs high nicotine cigarettes" study supports which model?

Which animals are used in experiments for the biological model?

What does nicotine actually do in the brain?