Does smoking track with depression in US adults?
In NHANES 2005–2018, daily smokers had ~2.4× the odds of PHQ-9 depression vs never smokers; longer cessation tracked lower odds.
Source
A cross-sectional study of smoking and depression among US adults: NHANES (2005-2018)
Study at a glance
- Design
- Cross-sectional — NHANES 2005–2018 smoking status/volume/cessation vs PHQ-9 depression
- N
- N=30524 · Adults ≥20 in final smoking-status analysis after exclusions
- Population
- US adults in NHANES with smoking and depression measures
- Outcome
- Clinically relevant depressive symptoms (PHQ-9 ≥10) by smoking patterns
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Analyzed adults ≥20 from NHANES 2005–2018, classifying smoking status, daily volume, and cessation duration against PHQ-9 ≥10 using multivariable logistic regression.
What they found
Previous (OR 1.25), occasional (OR 1.84), and daily smokers (OR 2.37) had higher depression odds than never smokers. Higher daily volume associated with higher odds (OR 1.65 trend); longer cessation associated with lower odds (OR 0.55 trend).
The limits
What it doesn't show
Cross-sectional data cannot establish whether smoking causes depression or depressed people smoke more; residual confounding remains.
Key terms
- PHQ-9
- Nine-item depression screen; ≥10 marks clinically relevant symptoms here.
- NHANES
- US National Health and Nutrition Examination Survey.
- Daily smoker
- Participant reporting smoking every day.
- Smoking cessation
- Time since quitting among former smokers.
- Odds ratio
- Relative odds of depression vs a reference group.
- Dose–response
- Higher smoking volume linked to higher depression odds.
Flashcards
Research intelligence for this paper
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Quiz yourself
Daily smoker depression OR vs never smokers?
Common questions
Depression definition?
PHQ-9 score ≥10.
Highest-risk smoking status?
Daily smokers (OR 2.37).
Does quitting matter?
Longer cessation linked to lower depression odds (OR 0.55).
Can this prove causation?
No—cross-sectional associations only.
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