Genetic variation in dopamine pathways differentially associated with smoking progression in adolescence (academic.oup.com)
I'd guess it must play on the same dopamine pathway as gambling — if all of us have the same probability of winning but only some small percentage do then there is excitement there. (wolfsgamingblog.com)
The integrity of the nigrostriatal dopamine pathway can be assessed using single photon emission computed tomography (SPECT) with dopamine transporter (DaT) radioligands. (mdsabstracts.org)