I know plenty of dirt stupid people who smoke.
I get out more than you ...
I also know more crazy people that smoke. It's not a myth that folks with schizophrenia have a higher ratio of smoker/nonsmoker than other psychiatric illnesses and persons who are not diagnosed.
Not all smokers are schizophrenics, but most schizophrenics smoke. (79% of the schizophrenic patient population according to the first study)
http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract
http://www.med.umich.edu/niclab/rese...izophrenia.htm