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:
Antonia Eliason & Robert Howse, A Higher Authority: Canada's Cannabis Legalization in the Context of International Law, 40 Mich. J. Int'l L. 327 (2019).
Paul J. Larkin, Jr., Cannabis Capitalism, 69 Buff. L. Rev. 215 (2021).
Daniel G. Orenstein and Stanton A. Glantz, Cannabis Legalization in State Legislatures: Public Health Opportunity and Risk, 103 Marq. L. Rev. 1313 (2020).
Francis J. Mootz III, Ethical Cannabis Lawyering in California, 9 St. Mary's J. Legal Mal. & Ethics 2 (2018).
Andrew Kingsbury, Patenting Pot: The Hazy Uncertainty Surrounding Cannabis Patents, 106 Cornell L. Rev. 1061 (2021).
Robert A. Mikos, The Evolving Federal Response to State Marijuana, 26 Widener L. Rev. 1 (2020).
Sean M. O'Connor & Erika Lietzan, The Surprising Reach of FDA Regulation of Cannabis, Even after Descheduling, 68 Am. U. L. Rev. 823 (2019).
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".