that marijuana impairs cognitive process and slows response time. If you run a factory with dangerous equipment you don't want someone impaired running your equipment because of the inherent danger. That has zero to do with scorn for the users, it is all about the safety issues. It is a fact that auto accidents are up in California due to marijuana use. It also slows production of other simple tasks in the workplace, such as processing paperwork, which hurts the bottom line for an employer. And those things don't even address customer response to those who are impaired, or smell of it.
https://www.usatoday.com/story/news/nation-now/2018/10/19/car-crashes-up-states-legal-marijuana-studies-show/1693567002/Edited by MizzouTigerz at 16:11:11 on 06/12/19