Hello! My first post! Your head probably isn't warped or cracked, because these problems are caused by overheating of the engine. Get the head hot and it will warp or crack, or both. White smoke isn't smoke, but more likely steam. Sounds like it is indeed going into the cylinder, and in turn going out through exhaust as steam. It will get worse, and your engine will suffer because of it. Your oil will lose its effectiveness because of the addition of coolant to it. Look for creaminess on the dipstick, as opposed to clear yellow, brown, or black oil. Bad gasket will cause this and will only get worse.