I had to laugh when I first saw this bit of wartime propaganda from 1918. Much of the food that was being harvested in that year was being shipped to Europe for the war effort (World War I). So there were a number of drives to get people to eat fresh fruits and veggies instead of canned. This one has to take the cake. "Eat plenty of green corn..." I'm assuming in this case they're referring to young corn. If you eat plenty of that you better take a good book into the bathroom because you're going to be there awhile. The ad is actually making a point of cooking and how it makes the corn palatable. True, but cooking tends to do that with alot of things but I digress.
The real point of the whole ad is that Lucky Strike Cigarettes are better because they are cooked, i.e. the tobacco is toasted. Back in the old days cigarettes were made with tobacco and paper and that's it. No BS chemicals and whatnot that they put into the tobacco now. Lucky Strike was always hocking the fact that their tobacco was 100% Burley and it was toasted for fuller flavor. I've gotten hold of 100% toasted burley tobacco and made cigarettes out of it and the taste was far different than we're used to now. Every company has their marketing ploy and it's the fun side of collecting old ads to see how companies differentiate themselves from their competitors.