Maternal tobacco, cannabis and alcohol use during pregnancy and risk of adolescent psychotic symptoms in offspring.
BACKGROUND
Adverse effects of maternal substance use during pregnancy on fetal development may increase risk of psychopathology.


OBJECTIVE
To examine whether maternal use of tobacco, cannabis or alcohol during pregnancy increases risk of offspring psychotic symptoms.


METHODS
A longitudinal study of 6356 adolescents, age 12, who completed a semi-structured interview for psychotic symptoms in the Avon Longitudinal Study of Parents and Children (ALSPAC) birth cohort.


RESULTS
Frequency of maternal tobacco use during pregnancy was associated with increased risk of suspected or definite psychotic symptoms (adjusted odds ratio 1.20, 95% CI 1.05-1.37, P = 0.007). Maternal alcohol use showed a non-linear association with psychotic symptoms, with this effect almost exclusively in the offspring of women drinking >21 units weekly. Maternal cannabis use was not associated with psychotic symptoms. Results for paternal smoking during pregnancy and maternal smoking post-pregnancy lend some support for a causal effect of tobacco exposure in utero on development of psychotic experiences.


CONCLUSIONS
These findings indicate that risk factors for development of non-clinical psychotic experiences may operate during early development. Future studies of how in utero exposure to tobacco affects cerebral development and function may lead to increased understanding of the pathogenesis of psychotic phenomena.
Zammit
Stanley
S
Department of Psychological Medicine, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4XN, Wales, UK. zammits@Cardiff.ac.uk
Thomas
Kate
K
Thompson
Andrew
A
Horwood
Jeremy
J
Menezes
Paulo
P
Gunnell
David
D
Hollis
Chris
C
Wolke
Dieter
D
Lewis
Glyn
G
Harrison
Glynn
G
D000293:Adolescent; D000428:Alcohol Drinking / Q000453:epidemiology* / Q000523:psychology; D002188:Cannabis / Q000009:adverse effects; D002648:Child; D004305:Dose-Response Relationship, Drug; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology* / Q000523:psychology; D018811:Maternal Exposure / Q000009:adverse effects; D011247:Pregnancy; D011264:Pregnancy Trimesters; D011297:Prenatal Exposure Delayed Effects; D011618:Psychotic Disorders / Q000453:epidemiology*; D012907:Smoking / Q000453:epidemiology* / Q000523:psychology