I'm thinking EB is one of those people that watches James Bond movies and goes "this is so unrealistic, no one guy could possibly do that." 
If it helps, the first Batman from Tim Burton has a few instances of Bats using smoke to good effect to make his escape. Smoke grenades can also can put out a good deal of smoke, etc.
If you want to be realistic, yes, you can't fill up a street just with smoke grenade levels probably. There's instances from Vietnam street fighting where smoke grenades from American troops would trigger fire from opposing North Vietnamese troops, so they improvised and used artillery rounds fired into buildings to make smoke cover for themselves that way.
But I still say have fun, it's a game!
Guide: Tanking, Wall of Fire Style (Updated for I19!), and the Four Rules of Tanking
Story Arc: Belated Justice, #88003
Synopsis: Explore the fine line between justice and vengeance as you help a hero of Talos Island bring his friend's murderer to justice.
Grey Pilgrim: Fire/Fire Tanker (50), Victory
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BABs has been thinking about Fiery Melee Stalkers...
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Where there's fire, there's smoke...and smoke hides just as well as being invisible. I could easily see a Fiery Melee or Fiery Aura Stalker work. Especially if Placate and Hide involved vanishing into a swirling mass of smoke and embers, and then reappearing in a sudden blazing flash when you strike, like a backdraft.
That could be pretty darn cool.
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I've never understood why smoke in this game can cause stealth. Yes smoke can obscure, but it has to be on a grand scale. A moving smoke cloud on a city street isn't very stealthy...
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Maybe the smoke cloud doesn't move, as it is centered on the person the would be stalker is hiding from...
SadysCHICK ALL the Badges! (I can get. 1396)
Full image by David Nakayama
Arc ID 1435: Performing without Annette
Arc ID 7206: Sadystic Tendencies
Arc ID 3864: The Chronicles of (In)FERNIA!