Why It’s So Hard to Kick the Habit
Cigarette smoking is a leading cause of preventable death worldwide and is associated with approximately 440,000 deaths in the United States each year, according to the U.S. Centers for Disease Control and Prevention, but nearly 20 percent of the U.S. population continues to smoke cigarettes. While more than half of U.S. smokers try to quit every year, fewer than 10 percent are able to remain smoke-free. Relapse commonly occurs within 48 hours of smoking cessation. However, learning about withdrawal and the difficulty of quitting can lead to more effective treatments to help smokers quit.
In a first of its kind study on nicotine addiction, scientists measured the responses to rewards during nicotine withdrawal. Findings from this multi-university study were published online on September10th 2014 in JAMA Psychiatry.
A release from Florida Atlantic University explains that response to reward is the brain’s ability to derive and recognize pleasure from natural things such as food, money, and sex. The reduced ability to respond to rewards is a behavioral process associated with depression in humans. In prior studies of nicotine withdrawal, investigators used very different behavioral measurements across humans and rats, limiting our understanding of this important brain reward system.
Using a translational behavioral approach, Michele Pergadia, Ph.D., associate professor of clinical biomedical science in the Charles E. Schmidt College of Medicine at Florida Atlantic University, who completed the human study while at Washington University School of Medicine; Andre Der-Avakian, Ph.D., who completed the rat study at the University of California San Diego (UCSD); and colleagues, including senior collaborators Athina Markou, Ph.D. at UCSD and Diego Pizzagalli, Ph.D. at Harvard Medical School, found that nicotine withdrawal similarly reduced reward responsiveness in human smokers – particularly those with a history of depression – as well as in nicotine-treated rats.
Pergadia, one of the lead authors, notes that replication of experimental results across species is a major step forward, because it allows for greater generalizability and a more reliable means for identifying behavioral and neurobiological mechanisms that explain the complicated behavior of nicotine withdrawal in humans addicted to tobacco.
The release quotes Pergadia as saying, “The fact that the effect was similar across species using this translational task not only provides us with a ready framework to proceed with additional research to better understand the mechanisms underlying withdrawal of nicotine, and potentially new treatment development, but it also makes us feel more confident that we are actually studying the same behavior in humans and rats as the studies move forward.”