Cannabis has been legal in Washington since 2012, but evidence-based information on using cannabis can be hard to find—especially for older adults. The Washington Poison Center will provide an overview of the basic principles of cannabis, including its most studied chemical compounds and common modes of use. Current evidence on short-and long-term health correlations, both therapeutic and harmful, will be discussed, including where (and why!) there are gaps in knowledge. This evidence will be examined through the lens of common older adult conditions, outcomes, and unique considerations.