Petroleum Derivatives Brain Damage.?

Is it true that petroleum derivatives like kerosene, naphta, paint thinner and gasoline eats away at your brain cells? I read a study that said that these petroleum products destroyed neurons by eating away the myelin sheath and by increasing the formation of reactive oxygen species which kills the brain cells by stealing electron. Then there was naother study that showed that even heavy paint huffers and gsoline sniffers showed no decreased brain m even after many years of doing it and that the only change between them and normal people is that their brains had severe edema with the brain cells being surrounded by lots of fluids. What is the bottom line of all this conflicting evidence????????