no, smog is a contraction of smoke and fog(originally observed in London when houses burned coal for heat and cooking), however it is usually used now to refer to a haze produced photochemically from car exhaust (photochemical smog). A mushroom cloud is a mixture of debris picked up, vaporized metal, smoke from fires, etc. produced by an explosion (nuclear or not).
Any: conventional, nuclear, or impact can cause a mushroom cloud.
mushroom cloud
No
A nuclear detination
A mushroom cloud is the product of a very large explosion, such as from the detonation of a nuclear weapon. The cloud itself is formed by the rapidly rising ball of hot gasses.
Surface burst
mushroom cloud, Hiroshima, radiation sickness, collateral damage,
Gravity if forming the clouds from the atomic bomb.
Surface
A shallow subsurface burst.
You tap the four sided arrow & tap the nuclear mushroom cloud.
If you are referring to the blast of a nuclear bomb, you could easily lose your vision.