> smokers are on average lower IQ Source? https://pubmed.ncbi.nlm.nih.gov/18606723/ https://pubmed.ncbi.nlm.nih.gov/18606723/ > Results: Lower IQ measured at

> smokers are on average lower IQ Source? https://pubmed.ncbi.nlm.nih.gov/18606723/ https://pubmed.ncbi.nlm.nih.gov/18606723/ > Results: Lower IQ measured at ages 18 to 20 was weakly associated with increased prevalence of smoking, independently of indicators of mental illness and social misbehavior measured in late adolescence. By contrast, smoking cessation later in life among those who smoked at ages 18 to 20 was not associated with IQ. Among smokers, lower IQ was significantly associated with a lower level of smoking after adjusting for other factors. > Conclusion: Low IQ was associated with an increased prevalence of smoking in adolescence. However, the main part of this association disappeared after adjustment for measures of mental health and social function in early life. IQ was not associated with likelihood of quitting smoking.