You may have never used boiled linseed oil alone, but if you have used an oil based stain or varnish, wiping varnish, Danish oil, Watco oil, Tung oil etc then you have been exposed to the same danger.
We take calculated risks all of the time. We routinely operate power tools that employ razor sharp blades, spinning at high speeds. We fill our lawnmowers, weed eaters, leaf blowers, etc with highly flammable gasoline. Heck, we even store gallons of it in our sheds and garages. Certain house hold cleaning products, if mixed together, will generate a toxic gas that can be fatal. My point is, we use these products in relative safety, because we are well aware of the dangers. BLO is no more dangerous than most of these products we use every day. The most important thing is to be aware of the risks. The steps required to mitigate those risks are simple and easy to follow.