Yes we had smoke from wildfires last fall that obliterated the tomatoes. Re; cages Started with round bent cattle panel cages but went to right angle bend 1/2 cages put together with zip ties ( visualize 2 pieces of angle iron placed together to make a square) Round ones were difficult storage but the 1/2 cages nest inside each other for storageIt is true that tomato leaf disease is often splashed up onto the leaves by rain and watering. Also disease is spread by splashes coming from already diseased foliage. Also some tomato leaf disease can be carried over winter on tomato cages or stakes. Also people move diseases around. Also smokers can transmit tobacco mosaic virus from cigs and cigars.
A good general rule is to never work or harvest when leaves are wet.