Meth is not a substance that is used singly. The high euphoria of the substance is best experienced only in parties and raves. This increases the quantum of usage of methamphetamine and also increases the feel-good factor that people associate temporarily when they use the substance. Also, because groups of people are using it together, there's a sense of recklessness among the users of this substance.
It is important to see how these substances come into the mainland of the US. The primary source is through illegal trafficking. Mexico is considered as a haven for methamphetamine production and it is the richest source of supply of the drug. There are various outlaw motorcycling groups and other illegal traffickers who are bringing the drug into the mainland through the highways. Despite the presence of various highway interdiction points, a lot of pure methamphetamine from Mexico makes its headway into various American states.