What was your birth gestation (weeks) and weight? It’s wouldn't directly be smoking during pregnancy, but I’ll bet you were a little smaller than average.
“Smoking stunts your growth” is probably more true neuropsychologicain utero than in life during childhood. A stunted embryo/baby hood in utero means that development is stunted. I haven’t seen any research on this, but I’d guess that includes brain development.
All alcohol and other drugs harm unborn babies. They even recommended expectant mothers cut down on caffeine.
BTW I’m older and have a Masters Degree in Autism. I actually knew the science and wa very up to date, but the research into autism, ADHD and child mental health moves at a very rapid rate. Even the research journals have difficulty keeping up, and a lot of the latest findings are presented at conferences.
Fwiw, autism research conferences started introducing “future leaders” programs and “autism friendly zones” about 15 years ago. Some people with autism get really interested in the research and those who are very very academic can get into research by studying psychology, neuropsychology, occupational therapy, physiotherapy or other fields. When I did my Masters, we had a few people who had confirmed diagnoses, plus some others of us who just knew we were a bit quirky.