Hi, Tom - no appology necessary. You did exactly the right thing. Anytime there is a potential health or safety issue, it should be announced.
I have heard similar stories about the toxicity of nitrobenzine and I therefore approach it with caution. I "spike" my fuel with a very small amount, mainly for the nostalgic smell.

One year at VSC, I had an interesting conversation with a very well known stunt flyer. He pontificated on the evils of nitrobenzine, stating quite adamantly what an intense carcinogenic it was. During the conversation, he chain smoked around three cigarettes!

During the fifties, many of the people I flew with in Buffalo, NY did speed (the event, not the drug!

) and the distinctive smell of nitrobenzine was always present. During the winter, we even had some indoor events where we flew in huge hangars at the Niagara Falls National Guard hanger. The smoke was so intense that it was difficult to see across the circle. Yet, of the many people I knew up there, I do not know of anyone who passed away due to complications caused by nitrobenzine.
Anyone else know of anybody?
Bob Z.