As psychotherapists, how do we think about clients who use cannabis? I suspect our opinions vary, based on factors such as race, culture, upbringing, value systems, personal experience, age, education, and so on. According to the National Survey on Drug Use and Health, “cannabis is the most commonly used illicit drug in the country,” and the Bay Area has the highest rate of use in the nation (Hughes, Lipari, & Williams, 2016). I believe that many of our perceptions of cannabis have been shaped by the prohibition and criminalization of this substance in the United States since the beginning of the 20th century. I also believe we have an ethical duty to educate ourselves on this history, as it informs both the collective and the personal unconscious and is largely unknown.