Here's why it's "toluene free" now.
"Inhaling high levels of toluene can cause death or unconsciousness. Repeatedly breathing toluene over long periods of time at work, or through deliberately "sniffing" or "huffing" glue or paint, can cause death, permanent brain damage, or depression. If you are pregnant, repeated exposure to toluene may increase the risk of damage to the fetus.
Exposure to high levels of toluene may affect your kidneys, nervous system, liver, brain, and heart. Direct, prolonged contact with liquid toluene or vapor can irritate the eyes, and cause dry skin and skin rashes. Ingesting toluene can cause vomiting, diarrhea, and difficult breathing.
Exposure to low to moderate levels of toluene can cause confusion, light-headedness, dizziness, headache, fatigue, weakness, memory loss, nausea, appetite loss, coughing, wheezing, and hearing and color vision loss.
Inhalation of toluene fumes can be intoxicating, but in larger doses nausea-inducing. Toluene may enter the human system not only through vapor inhalation from the liquid evaporation, but also following soil contamination events, where human contact with soil, ingestion of contaminated groundwater or soil vapou off-gassing can occur.
The toxicity of toluene can be explained mostly by its metabolism. As toluene has very low water solubility, it cannot exit the body via the normal routes (urine, feces, or sweat). It must be metabolized in order to be excreted."