The co-use of cannabis with alcohol, both concurrent and simultaneous, is evidenced to be a dominant mode of cannabis consumption in North America in a range of recreational consumption contexts. Research also shows that co-use, as opposed to isolated consumption, increases typical cannabis-associated risks additively, such as driving under the influence and experiencing health concerns due to drug use. However, despite how common and risky cannabis and alcohol co-use is, it is rarely considered in policies apropos cannabis legalization, despite ample opportunity to do so when designing an adult-use cannabis retail market. Through statistical analysis of contemporary, nationally representative datasets from the US and Canada, my research provides updated estimates of the prevalence, determinants, and risks of cannabis and alcohol co-use in North America, highlighting that concurrent and simultaneous co-use is a frequent mode of consumption and should be of policymaker concern. I then apply LLM-based text analysis methods to legislative documentation on Canadian cannabis regulation, demonstrating the frequent lack of consideration towards cannabis and alcohol co-use in regulatory frameworks in the Canadian context. With examples, I suggest further research should explore ways we can factor co-use into cannabis policy, and that this is of critical importance to the protection of public health and safety.