You can smell day hikers before you can see them; shampoo, deodorant, laundry detergent, body spray, aftershave.
Then there are tour groups with a catered lunch served out on the trail ... Smells yummy, but while “hiking”?
I hiked the “Camino De Santiago”. Started in St. Jean in southern France, over the Pyrenees into Spain, and all the way west to the Cathedreal in Santiago. 500 miles in 28 days. One day to rest about mile 350. My feet hurt.