Nurses Health Study had 1528 incident #RA cases. Current smoking increased risk of seropositive (not Seronegative) RA (HR 1.47). Smoking cessation >10, >20, >30 yrs ago assoc w/ decreasing risk of seropos. RA, but risk still remains > 30 yrs (HR 1.30) https://t.co/1CsIcXtJ1I