There’s a reason for this. 
The Washington State University Elson S. Floyd College of Medicine recently published a study that shows the prevalence of cannabis producers, processors, and retailers in low-socioeconomic areas throughout Washington State. The research showed that cannabis businesses are more prevalent in low-socioeconomic areas compared to higher-socioeconomic areas.
WSU researchers used data from the Washington State Liquor and Cannabis Board and Census Bureau between 2014 and 2017. Data revealed that the number of cannabis producers, processors, and retailers all more than doubled in low-socioeconomic neighborhoods in those three years. Retailers increased the most by 258% between 2014 and 2017. According to the research, the “most socioeconomically disadvantaged neighborhoods” had higher rates of cannabis businesses each year compared to other neighborhoods throughout Washington.
WSU researchers claim that the lower cost of real estate and less resistance to cannabis presence could be explanations for the disparity, but more studies are necessary to fully understand.
https://pullmanradio.com/wsu-research-reflects-cannabis-prevalence-in-low-socioeconomic-areas/