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SEOUL — While many smokers reach for a cigarette to "calm their nerves," a new study suggests that the habit may actually be exacerbating mental health issues rather than solving them.

According to a report titled "Association between Smoking Cessation Duration, E-cigarette Transition, and Mental Health" published by the Korea Disease Control and Prevention Agency (KDCA) on March 5, 2026, smokers are significantly more vulnerable to depression, suicidal ideation, and poor sleep quality compared to non-smokers.

The "Dual User" Danger
The study analyzed data from 218,921 individuals. Using a baseline score of 1.0 for non-smokers' depression levels, the research revealed alarming figures for tobacco users. Those who exclusively smoke traditional cigarettes scored 2.53, while exclusive e-cigarette users scored 2.8.

The most at-risk group, however, were "dual users"—those who use both traditional and e-cigarettes. Their depression score soared to 3.74, indicating they are more than three times as likely to suffer from depressive symptoms as those who do not smoke.

Suicidal Ideation and Sleep Quality
The trend extended to other mental health metrics. Suicidal ideation (thinking about suicide and seeking professional counseling within the past year) was 3.57 times higher among e-cigarette users compared to non-smokers.

Sleep quality also suffered. According to the Pittsburgh Sleep Quality Index (PSQI), dual users were nearly twice as likely (1.85) to report poor sleep compared to the non-smoking control group.

The Nicotine Trap
Experts warn that the perceived "stress relief" from smoking is a biological illusion. "Nicotine triggers a temporary dopamine release in the brain, which briefly boosts mood," explains Dr. Kim Yeol, President of the Korean Society for Research on Nicotine and Tobacco and a professor at the National Cancer Center.

"However," Dr. Kim continues, "about 30 minutes after smoking, nicotine levels drop, leading to a decrease in dopamine. This cycle impairs the brain's natural reward system. Consequently, smokers become less capable of managing stress without nicotine, which amplifies feelings of anxiety and depression."

The Path to Recovery
The study offered a glimmer of hope for those looking to quit. Former smokers showed significantly better mental health scores than active smokers, with metrics improving the longer they remained smoke-free.

"Quitting smoking is not just a physical health choice; it’s a mental health necessity," says Dr. Kim. "Replacing the habit with physical activity is far more effective at overcoming stress and depression in the long run."

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