Interesting. Having grown up in the southwest I had only ever been exposed to creosote as in the bush that gives off the incredible smell when it rains in the Sonoran desert.
Reading on creosote tar and was interesting to see no citations (on Wikipedia) for the toxicity, and yet a couple studies against it:
“A 2005 mortality study of creosote workers found no evidence supporting an increased risk of cancer death, as a result of exposure to creosote. Based on the findings of the largest mortality study to date of workers employed in creosote wood treating plants, there is no evidence that employment at creosote wood-treating plants or exposure to creosote-based preservatives was associated with any significant mortality increase from either site-specific cancers or non-malignant diseases. “