Don't smoke. Along with other things, smoking can really damage your eyes. It can cause cataracts, macular degeneration, and optic nerve damage. Not only that, but it is harmful in other ways to other areas of your body. If you are having a hard time quitting smoking, keep trying, it will be worth it when you are successful.
Always wear safety goggles when coming in contact with hazardous materials, regardless of if you are at work or at home. It is best to keep a pair of these goggles in both locations, just in case you are faced with a situation where you need them. Do not take the safety of your eyes for granted.