A hazardous journey through thickening fog.

穿行在渐厚浓雾中的危险行程。

This, obviously, creates a financial incentive for individuals to become drug mules and risk the hazardous journey across the border with illicit substances.

很明显，这将使得更多的人由于物质的激励变成“毒品骡子”（即人体带毒者——译者注），冒着风险非法穿越边境。