I've written quite a lot regarding this topic before so I'll be brief here.
Autistic spectrum individuals are notably, and significantly, not smokers. In fact, this attribute is a diagnostic feature. Amongst all neuro/psych disorders, ASD are remarkably distinct in that we do NOT smoke as opposed to all the others. For instance, the proportion of smokers amongst schizophrenics is astronomically high as compared to the general population.
In brief (since I've covered before): ASD are associated with nicotonic receptors in the brain where our nicotonic receptors are literally flooded; to smoke would be nearly overflow to even sickening. (Please do check this out on PubMed, for instance). Separately, as far as sociological influences regarding smoking: Correct, in that we know that many smokers begin smoking (i.e., as teen-agers) because it's "popular" and/or "cool" and we know that ASD individuals may be largely excluded from these societal peer pressures.
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The ones who say “You can’t” and “You won’t” are probably the ones scared that you will. - Unknown