Here are two articles both on a recent study published in the Journal of Neuroscience:

Harvard Scientists Studied the Brains of Pot Smokers, and the Results Don’t Look Good

Study of Pot Smokers’ Brains Shows That MRIs Cause Bad Science Reporting

These would be excellent articles to use to help students develop the skill of accessing valid and reliable information. There is a lot here to analyze and it is a topic that is both relevant and timely in light of changes in marijuana use laws across the country.