Maternal grandmother smoking in pregnancy is associated with an increased in prevalence of two autistic traits (poor social communications and repetitive behaviors), and diagnosed autism, in the grandchild, based on an initial sample size of 14,541.

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Maternal grandmother smoking in pregnancy is associated with an increased in prevalence of two autistic traits (poor social communications and repetitive behaviors), and diagnosed autism, in the grandchild, based on an initial sample size of 14,541.