The following video by National Geographic discusses the mechanisms of addiction of Methamphetamine (also known as Meth and Tik).
It is oriented to a general audience. However, it’s useful to review the brain reward system and some important dopamine pathways.
You may also be interested in other posts such as:
Addiction, Dopamine, and the Molecular Mechanisms of Memory. Neuron, Vol. 25, 515–532, March, 2000. Free Full Text – PDF –
Is there a common molecular pathway for addiction? EJ Nestler – Nature neuroscience, 2005. Free Full Text – PDF –