Thread by @ChaunceyGardner

Claim: "Nicotine harms developing brains."

#FactCheck: "Educational achievement did not differ within twin pairs discordant for smoking, in adults and adolescents."
@SetNicFree
tweelingenregister.org/nederlands/ver…

Claim: "Nicotine harms developing brains."

#FactCheck: “The [inverse] IQ–smoking association disappeared after adjustments for shared environment and genetics.”
@SetNicFree
gwern.net/docs/iq/2010-w…

Claim: "Nicotine harms deveping brains."

#FactCheck: “Past smoking was not associated with significantly poorer performance than never-smokers in any cognitive domain.”
@SetNicFree
research.ed.ac.uk/portal/files/1…
research.ed.ac.uk/portal/files/1…

Claim: "Nicotine harms developing brains."

#FactCheck: Some rodent studies suggest brain changes (not necessarily harms), but similar rodent studies exist for caffeine:
ncbi.nlm.nih.gov/pmc/articles/P…
ncbi.nlm.nih.gov/pubmed/24726984

Claim: "Nicotine harms developing brains."

#FactCheck: Clinical studies suggest some cognitive improvements as a result of nicotine.
ncbi.nlm.nih.gov/pubmed/20414766
n.neurology.org/content/78/2/9…

Claim: "Nicotine harms developing brains."

#FactCheck: Smoke-free nicotine reduces risk of Parkinson’s disease by 60%.
@SetNicFree
ncbi.nlm.nih.gov/pubmed/27940486