Mostly not. Somehow, the general public has been convinced that nuclear war means wiping out all life on the planet (when in reality it would be horrible, and kill an unimaginably large number of people, but wouldn't even wipe out humanity, let alone all life) and accordingly the effects of a nuclear explosion have been vastly exaggerated in the mind of the average Joe.
Part of the problem is probably linear extrapolation from Hiroshima to the Tsar Bomba, not realizing that blast radius scales up very much sub-linearly, practical bombs meant to be used in war are way smaller than Tsar Bomba, and Hiroshima was basically constructed out of paper.
