he has been working about 5 years with soder fumes and working with metal.
and then another 2 years of working with resin and all their fumes, the shop he works in has an exaust but its nothing near what we should have.
im not really sure what you mean by your last statement, but for now he will have to stop pulling and stay as he is. other then the back pain he doesnt have any other health problems
once the back pain is better i really hope he will resume the op.
he understands that he is sick because he is so toxic, so hopefully that will be reason enough to start again later.