I have pulmonary fibrosis, cause as yet undetermined (never smoked). please comment on the safety of putting nebulized dmso into the lungs.

Not safe: I would advise you not to put any such chemical into your lungs. I do not know of any good medical/scientifically valid data that supports such a use for dmso. You could actually make matters worse by putting any foreign body/chemicals into your lung. So play it safe.

Pulmonary Fibrosis: I know how tough the diagnosis is. It is frustrating because whatever treatments we thought intuitively would work did not, and in fact some worsened the condition. In this case, worse condition robs you of breath. Dmso is a radical scavenger. No one knows if it would carry stuff from the nebulizer tubing to your lungs or even trigger a flare of your pulm fibrosis: i would not advise that at all.