If you keep dying like that you need to start being more aware and recognize when smokes might be one-way. For example you have to be aware that people might jump up to come slightly above the smoke and in that case they get a one-way and can see you but you can't see them. If you just learn to be aware of the possibility that such plays exist then you won't die to it as often. Also, fading smokes are advantageous to the person standing inside them as they fade - they'll see you a half-second before you can see them. Go back behind cover when a smoke is fading and peek out afterwards.