What are my chances of winning against my employer for making me spray lacquer paint for almost ten months without a respirator or a spray booth?

Sorry to hear of your situation. If the injury occurred in Oregon and your employer was compliant with workers compensation rules it will be very difficult to hold them liable for a personal injury. That is because the comp rules in Oregon provide the employer with immunity under certain circumstances. If your employer had workers compensation coverage you could file a claim with the insurance carrier to help with your medical treatment, wage loss and any permanent disability. If your employer did not have workers compensation coverage of some form you may have a potential injury claim them. Also, if there were any third parties involved in the work that caused injury to you you may have a valid claim against those parties. You should consult with either a workers compensation attorney or a personal injury attorney to see what you might want to do. Good luck.