e-cigarette use assoc w/ a 1.5-fold incr risk of RA & SLE. All of Us Research prg matched 15,909 e-cig users vs nonusers. 66 new RA or SLE among current e-cig (IR 1.43/1,000PYs) vs nonusers (0.93/1,000PYs; IRR 1.54); applies to past or current smokers https://t.co/xYRezwQFYC https://t.co/pnNANfui4Y