Not lost, but sometimes I couldn't see either. I got caught in heavy fog, once, in the Blue Mountains (SE WA) hunting elk. It was impossible to see more than a couple feet, but I was on a trail headed down a ridge and back to camp. Walking slowly through a group of trees, I found myself in the middle of a dozen or so elk, bedded along the same trail. They couldn't see either and obviously were caught on the trail when the fog hit the valley. When they got up and started running, they left a trail of broken limbs and small trees in their wake. Several ran by close enought to touch.
I have been caught out after dark, and in heavy snow fall, and each time I knew, how to find my way back to camp, or the truck. If I am in unfamiliar area, I make a point of getting back early, and always take a flash light, head lamb, and batteries. Emergency items are always with me, if I am far from camp.