Jaydog, I appreciate your posts as well as all research and info. on autism. Your post reminded me of this study below. They found that mothers using cocaine while pregnant have a 1 in 9 chance of having autistic children. It's pretty clear based on the scientific evidence that environmental factors are involved.
J Natl Med Assoc. 1992 Apr;84(4):315-9.Links
Autism and developmental abnormalities in children with perinatal cocaine exposure.
Davis E, Fennoy I, Laraque D, Kanem N, Brown G, Mitchell J.
Department of Child/Adolescent Psychiatry, Harlem Hospital, New York, New York 10037.
Cocaine in all forms is the number one illicit drug of choice among pregnant women.
Records of 70 children with cocaine exposure in utero who were referred for developmental evaluation at a large inner-city hospital were reviewed in an effort to determine whether a specific pattern of abnormalities could be discerned...Significant neurodevelopmental abnormalities were observed, including language delay in 94% of the children and an
extremely high frequency of autism (11.4%). The high rate of autistic disorders not known to occur in children exposed to alcohol or opiates alone suggests specific cocaine effects.
http://www.ncbi.nlm.nih.gov/pubmed/1380564