Use your ownjudgment here,but I'm 66 yrs old and have used lacquer thinner, paint thinners, ect., ect for years (usually outside) with no ill efects. Now this is on an interment basis not on a daily or weekly basis. If using in an enclosed space peobably a totally different story however, but then again is it anymore dangerous than smoking? Or for that matter driving down the road with all these nuts talking on their cell phones and/or texing, and then again we have the drunk drivers.
I realize thise this doesn't answer your question specifically, but what I'm bringing out dangers are all around us and VERY hard to escape them. Plus in todays world a lot of the chemical hazards are blown clear out of perportation. Just check out the hazerds of a flourscent bulb, and we've been breaking these for years and there isn't dead bodies laying all along the streets.