According to new research published in JAMA Psychiatry comparing two studies, similar in design, conducted in 2001â2002 and 2012â2013, the rate of marijuana use by adults in the U.S. has more than doubled. Additionally, while usage rates have increased from 4.1% to 9.5%, disorders related to marijuana use, such as dependence or drug abuse as defined by the Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition), has increased nearly 50%, rising from a past-year 1.5% increase in prevalence rate in 2001 to 2.9% in 2013.
The study defined marijuana use as any form of marijuana consumption (e.g., ingestion or smoking) within a year prior to each study. While the increase in prevalence was observed across most demographics, researchers note the increases were most evident among four groups: African Americans (from 4.7% in 2001 to 12.7% in 2013), Hispanics (3.3% to 8.4%), women (up from 2.6% to 6.9%), and older people (an increase from 0.04% to 1.3%).
The comparative studyâs authors speculate that the increase in use prevalence in African American and Hispanic demographics may be explained by the still-widening income gap following the economic recession that hit the U.S. in 2008. The authors suggest this gap may have lead âto increased minority stress and demoralization and substance use as a coping mechanism.â
In terms of marijuana use disorders, while the one-year increase in prevalence rate nearly doubled from 2001 to 2013, the prevalence among marijuana users dropped a little more than 15%, declining from 35.6% in 2001 to 30.6% in 2013. Despite this decline in disorders among users, the authors warn that the 30.6% prevalence of marijuana use disorders among users still proves that while the number of users grows, so too will the number of those diagnosed with use disorders. For example, while approximately 29,925,000 Americans used marijuana in 2013, 30%â8,977,500 peopleâhad a use disorder; if we assume the number of users will double again in the 12 years after 2013, that would mean that by 2025, approximately 59,850,000 Americans would be users and 17,955,000 would have a use disorderâdouble the number in 2013.
Of course, these numbers are entirely subjective projections that donât take the changing attitudes and laws toward the use of marijuana into consideration. Currently, 23 states have legalized medical marijuana and four states have legalized recreational use. As is expected, states with laws approving medical or recreational use of the drug have a higher use prevalence compared to those that restrict or criminalize marijuana.
Commenting on the findings, Dr. Wilson Compton, deputy director of the National Institute on Drug Abuse, says, âThis study is highly important because it highlights the significance of marijuana use disorders in the U.S. population,â adding that the next step is an examination of âhow marijuana use and disorders affect functioning, co-occurring psychiatric disorder, and other aspects of health and social functioning.â
Besides addiction, the authors note that increased risks associated with the use of marijuana also include vehicle crashes, psychiatric and mental health symptoms or illnesses, poor quality of life, cognitive decline, emergency department visits, and increased likelihood of the use and abuse of other drugs.
Deborah Hasin, lead author of the study and Columbia University professor of epidemiology, concludes that âMost Americans see marijuana, a natural substance, as harmless, but it is not. Some can use [marijuana] without harm, but itâs important for healthcare professionals, policy makers, and the public to be aware that users are at risk for addiction. This should be communicated not with scare tactics but in a balanced manner.â
Sources for Todayâs Article:
Davis, M., âMarijuana Use, Disorders Double in US Adults,â Medscape web site, October 23, 2015; http://www.medscape.com/viewarticle/853145?nlid=89763_3681&src=wnl_edit_dail&uac=247315HK&impID=867390&faf=1.
Hasin, D.S., et al., âPrevalence of Marijuana Use Disorders in the United States Between 2001-2002 and 2012-2013,â JAMA Psychiatry October 21, 2015, doi: 10.1001/jamapsychiatry.2015.1858, http://archpsyc.jamanetwork.com/article.aspx?articleid=2464591.