Smoking also replaces oxygen, needed by your muscles, with carbon monoxide. Both obesity and extreme slenderness are associated with higher risk for injury. Women are more susceptible to RSI than men. This may be due, in part, to the higher proportion of women doing repetitive tasks. Women, however, have smaller muscles with which to do the heavy keyboard work.
Pregnant women are particularly at risk for carpal tunnel syndrome.
Patients with cool hands heal more slowly, which may indicate poor circulation. I wear elbow length, fingerless, wool gloves to keep my wrists toasty warm. A poorly designed workstation can cause injury. Poor design, however is not the only culprit - repetitive work itself is hazardous. Without redesigning your work and health habits, you remain at risk.