Investigating the possible causal association of smoking with depression and anxiety using Mendelian randomisation meta-analysis: the CARTA consortium
Objectives To investigate whether associations of smoking with depression and anxiety are likely to be causal, using a Mendelian randomisation approach.
Design Mendelian randomisation meta-analyses using a genetic variant (rs16969968/rs1051730) as a proxy for smoking heaviness, and observational meta-analyses of the associations of smoking status and smoking heaviness with depression, anxiety and psychological distress.
Participants Current, former and never smokers of European ancestry aged ≥16 years from 25 studies in the Consortium for Causal Analysis Research in Tobacco and Alcohol (CARTA).
Primary outcome measures Binary definitions of depression, anxiety and psychological distress assessed by clinical interview, symptom scales or self-reported recall of clinician diagnosis.
Results The analytic sample included up to 58 176 never smokers, 37 428 former smokers and 32 028 current smokers (total N=127 632). In observational analyses, current smokers had 1.85 times greater odds of depression (95% CI 1.65 to 2.07), 1.71 times greater odds of anxiety (95% CI 1.54 to 1.90) and 1.69 times greater odds of psychological distress (95% CI 1.56 to 1.83) than never smokers. Former smokers also had greater odds of depression, anxiety and psychological distress than never smokers. There was evidence for positive associations of smoking heaviness with depression, anxiety and psychological distress (ORs per cigarette per day: 1.03 (95% CI 1.02 to 1.04), 1.03 (95% CI 1.02 to 1.04) and 1.02 (95% CI 1.02 to 1.03) respectively). In Mendelian randomisation analyses, there was no strong evidence that the minor allele of rs16969968/rs1051730 was associated with depression (OR=1.00, 95% CI 0.95 to 1.05), anxiety (OR=1.02, 95% CI 0.97 to 1.07) or psychological distress (OR=1.02, 95% CI 0.98 to 1.06) in current smokers. Results were similar for former smokers.
Conclusions Findings from Mendelian randomisation analyses do not support a causal role of smoking heaviness in the development of depression and anxiety.
Full author list: Taylor, Amy E. ; Fluharty, Meg E. ; Bjørngaard, Johan H. ; Gabrielsen, Maiken Elvestad ; Skorpen, Frank ; Marioni, Riccardo E. ; Campbell, Archie ; Engmann, Jorgen ; Mirza, Saira Saeed ; Loukola, Anu ; Laatikainen, Tiina ; Partonen, Timo ; Kaakinen, Marika ; Ducci, Francesca ; Cavadino, Alana ; Husemoen, Lise Lotte N. ; Ahluwalia, Tarunveer Singh ; Jacobsen, Rikke Kart ; Skaaby, Tea ; Ebstrup, Jeanette Frost ; Mortensen, Erik Lykke ; Minica, Camelia C. ; Vink, Jacqueline M. ; Willemsen, Gonneke ; Marques-Vidal, Pedro ; Dale, Caroline E. ; Amuzu, Antoinette ; Lennon, Lucy T. ; Lahti, Jari ; Palotie, Aarno ; Räikkönen, Katri ; Wong, Andrew ; Paternoster, Lavinia ; Wong, Angelita Pui-Yee ; Horwood, L. John ; Murphy, Michael ; Johnstone, Elaine C. ; Kennedy, Martin A. ; Pausova, Zdenka ; Paus, Tomáš ; Ben-Shlomo, Yoav ; Nohr, Ellen A. ; Kuh, Diana ; Kivimaki, Mika ; Eriksson, Johan G. ; Morris, Richard W. ; Casas, Juan P. ; Preisig, Martin ; Boomsma, Dorret I. ; Linneberg, Allan ; Power, Chris ; Hyppönen, Elina ; Veijola, Juha ; Jarvelin, Marjo-Riitta ; Korhonen, Tellervo ; Tiemeier, Henning ; Kumari, Meena ; Porteous, David J. ; Hayward, Caroline ; Romundstad, Pål R. ; Smith, George Davey and Munafò, Marcus R.; Open Access article; This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/