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marriedplus3 What do you mean, really? Like it is some kind of fake news? Nuclear detonations create fallout that depends on the size and type of the detonation, weather, topography, height of detonation, and other factors. Some radioactive isotopes have long half lives, which means the radiation will remain in the environment for generations. Cesium 137 and Strontium 90 have half lives of 28-30 years, so half of all the radiation due to those isotopes will be there 30 years later, and a quarter in 60 years, and so on. Both get into the human body readily and induce bone and other cancers. People still get cancer from the Nagasaki and Hiroshima nuclear blasts. There are also reproductive effects.
Your money saving nuclear war plan would sentence millions of people to immediate death and/or medical problems lasting well past 2100.