America's drug habit is where the money, the route (ph), all begins.

美国的毒品习惯是金钱和路线的源头。

Meanwhile, scientists do know that addiction is at least partly genetic, and some people are more predisposed to form drug habits.

同时，科学家们确实知道成瘾至少部分是遗传的，有些人更容易养成吸毒习惯。