Journals can be very helpful both in pointing you to other primary source materials, as well as providing insightful legal analysis. Journals can be especially helpful in the area of cannabis law because they may point you to scientific and technical sources that would be harder to find on legal databases.
There are not many journals that focus solely on cannabis law, likely because it is a relatively new and emerging area of law. There is one journal, the Cannabis Law Journal, with articles on cannabis from 2016-present.
There are also several specific journal articles that discuss cannabis law, and some of those are listed below:
Paul J. Larkin, Jr., Cannabis Capitalism, 69 Buff. L. Rev. 215 (2021).
Robert A. Mikos, The Evolving Federal Response to State Marijuana, 26 Widener L. Rev. 1 (2020).
Other journal articles on cannabis law can be searched for on Lexis's or Westlaw's Law Reviews & Journals pages, using search terms such as "cannabis" or "marijuana".