From German TV news some time ago: they examined rubber-coated tool grips, and soft PVC stuff, and we often read the sign "made in China" on that. They found plenty of toxic substances in them, they can be smelled, and they get precipitated into the environment (your hand and skin), the critical tresholds allowed by law regularly got exceeded by factors of several thousands. They said that holding some of these typical smelly grips for three minutes makes your body absorb toxic substances similiar to the effect of smoking 3600 cigarettes.
Lesson learned: if that rubber thing you use has this typical oil-like smell on it, dispose it as hazardous waste immediately. And cheap tools being sold in the supermarket often are like this.
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If you feel nuts, consult an expert.
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