Quoted from Neal_W:Respiratory irritants can affect different people different ways, and the OSHA exposure limit numbers don't mean much to me.
The bottom line is you must use chemical gloves and ventilation for safety, and common sense says always seek out a less toxic alternative when available.
Throwing on a pair of rubber gloves and a respirator takes seconds, and seems like a reasonable precaution when working with something like naphtha.
Respirators are cheap, and you really should have one if you do anything remotely interesting in your shop.
https://www.amazon.com/3M-Comfort-Facepiece-Reusable-Respirator/dp/B00IF7RCU6
Get some particulate filters for sanding, sawing, etc. (far superior to the "protection" provided by a "comfort mask").
https://www.amazon.com/Particulate-Nuisance-Organic-Release-2097PA1/dp/B007STCT00/
And then get VOC filters for naphtha use (and use it when you're spray painting or using other volatile chemicals).
https://www.amazon.com/3M-Cartridge-60923-Respiratory-Protection/dp/B00AEFCKKY/
Opinions differ, of course, but you only get one set of lungs so spending $50 to take care of them seems reasonable.
