The link between cannabis use and cognitive functioning has captivated scientists and the public. In this section, we present our original study followed by a commentary on the study, some letters to the editor, and two subsequent studies. In addition, we provide links to media coverage, most of which is serious and some of which is funny. Collectively, these readings lay out some of the concerns and controversies in this area of research. These readings can be packaged together for teaching purposes.
Meier MH, Caspi A, Ambler A, Harrington HL, Houts R, Keefe RSE, McDonald K, Ward A, Poulton R, Moffitt TE
Persistent cannabis users show neuropsychological decline from childhood to midlife
2012 Proceedings of the National Academy of Sciences Plus 109:2657-2664
Letters to the Editor
Rogeberg O (2013) Correlations between cannabis use and IQ change in the Dunedin cohort are consistent with confounding from socioeconomic status. PNAS, 110:4251-4254.
Daly M (2013) Personality may explain the association between cannabis use and neuropsychological impairment. PNAS, 110:E979
Moffitt TE, Meier MH, Poulton R, Caspi A. (2013). Reply to Rogeberg and Daly: No evidence that socioeconomic status or personality differences confound the association between cannabis use and IQ decline. PNAS, 110:E980-2
Here are subsequent, independent reports about the link between cannabis use and neuropsychological decline.
It is instructive to read Meier et al. alongside these articles, and to compare and contrast the approaches and conclusions
Auer R et al. (2016). Association Between Lifetime Marijuana Use and Cognitive Function in Middle Age: The Coronary Artery Risk Development in Young Adults (CARDIA) Study. JAMA: Internal Medicine, February 01, 2016. doi:10.1001/jamainternmed.2015.7841
Here are some interesting reactions to, and discussions about, our research into the link between cannabis and cognitive functioning.
Nature, Message from the Director of NIDA-Dr. Nora Volkow, Teen cannabis use lowers IQ, despite claims to the contrary, Interview with NIDA, Legalized Pot: Washington Post OpEd, Legalized Pot: NY Times OpEd,
The Potency of Cannabis
2016 NIH marijuana and cannabinoid conference
This conference features many informative presentations. Madeline Meier also speaks about the cannabis-IQ link on Day 1, at 2 hours and 36 minutes.