Cited by 78Bipolar Disorder and TreatmentSmoking Behavior and CessationGenetic Associations and Epidemiology

Smoking and the risk for bipolar disorder: evidence from a bidirectional Mendelian randomisation study

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Vermeulen, Jentien M., Wootton, Robyn E., Treur, Jorien L., Sallis, Hannah M., Jones, Hannah J., Zammit, Stanley, van den Brink, Wim, Goodwin, Guy M. +2 more·2021·The British Journal of Psychiatry

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Abstract

Background: There is increasing evidence that smoking is a risk factor for severe mental illness, including bipolar disorder. Conversely, patients with bipolar disorder might smoke more (often) as a result of the psychiatric disorder. Aims: We conducted a bidirectional Mendelian randomisation (MR) study to investigate the direction and evidence for a causal nature of the relationship between smoking and bipolar disorder. Method: We used publicly available summary statistics from genome-wide association studies on bipolar disorder, smoking initiation, smoking heaviness, smoking cessation and lifetime smoking (i.e. a compound measure of heaviness, duration and cessation). We applied analytical methods with different, orthogonal assumptions to triangulate results, including inverse-variance weighted (IVW), MR-Egger, MR-Egger SIMEX, weighted-median, weighted-mode and Steiger-filtered analyses. Results: Across different methods of MR, consistent evidence was found for a positive effect of smoking on the odds of bipolar disorder (smoking initiation OR IVW = 1.46, 95% CI 1.28–1.66, P = 1.44 × 10 −8 , lifetime smoking OR IVW = 1.72, 95% CI 1.29–2.28, P = 1.8 × 10 −4 ). The MR analyses of the effect of liability to bipolar disorder on smoking provided no clear evidence of a strong causal effect (smoking heaviness beta IVW = 0.028, 95% CI 0.003–0.053, P = 2.9 × 10 −2 ). Conclusions: These findings suggest that smoking initiation and lifetime smoking are likely to be a causal risk factor for developing bipolar disorder. We found some evidence that liability to bipolar disorder increased smoking heaviness. Given that smoking is a modifiable risk factor, these findings further support investment into smoking prevention and treatment in order to reduce mental health problems in future generations.

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Authors
Vermeulen, J. M., Wootton, R. E., Treur, J. L., Sallis, H. M., Jones, H. J., Zammit, S., van den Brink, W., Goodwin, G. M., de Haan, L., & Munafò, M. R.
Affiliations
  • Amsterdam University Medical Centers (NL)
  • University Hospitals Bristol NHS Foundation Trust (GB)
  • University of Bristol (GB)
  • Oxford Health NHS Foundation Trust (GB)
Corresponding author
Vermeulen, Jentien M.
Venue
The British Journal of Psychiatry
Published
2019-09-17
Volume
218
Issue
2
Pages
88-94
ISSN
  • 0007-1250 (ISSN-L)
  • 1472-1465
OpenAlex
W2974729007
Cited by
78
References
62
Citations by year
2026: 3 · 2025: 10 · 2024: 13 · 2023: 11 · 2022: 14 · 2021: 11 · 2020: 13 · 2019: 3
FWCI
8.17
Type
journal article
Language
en
Open access
Locations
  • The British Journal of Psychiatry (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion, cc-by)
  • ORCA Online Research @Cardiff (Cardiff University) (acceptedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
  • Bristol Research (University of Bristol) (submittedVersion, other-oa)
Funders
  • University Hospitals Bristol NHS Foundation Trust
  • National Institute for Health and Care Research
  • University of Bristol (MC_UU_00011/7)
  • Medical Research Council (MC_UU_00011/7, MR/K023195/1, MR/L010305/1, MC_UU_00011)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Bipolar Disorder and Treatment
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
smoking, bipolar disorder, smoking initiation, lifetime smoking, smoking heaviness, smoking cessation, causal risk factors, bidirectional causality, severe mental illness, smoking prevention
MeSH terms
Bipolar Disorder, Humans, Smoking, Smoking Cessation, Polymorphism, Single Nucleotide, Genome-Wide Association Study, Mendelian Randomization Analysis

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