Swedish study of 4033 incident RA vs 6485 controls - Exposure to occupational inhalable increased risk ACPA+ RA (OR 1.25). Occupational inhalable agents plus smoking and shared epitope markedly elevated risk (OR 18.22) esp in ACPA+RA https://t.co/4lKLEhkURm https://t.co/HFhz8lMR10