Hi there,
We're all either stupid, crazy or blind, but we for the life of us cannot find a 'Smoke Grenade' or 'Smoke Bomb' in any rulebook. We know Blind Grenades exist, but the rules seem to support the existence of a 'Smoke Bomb', but we simply cannot locate it.
Help us!!! 
BYE
Which rulebook is the 'Smoke Bomb' in?
There is a smoke grenade listed in the RT core [p. 126], but in flicking back through my DH material I haven't seen one listed.
Page 129, 210 (suffocation), 213 (treacherous environment) of the core rule book talks about the Smoke effect which the Blind grenade has. IH has powder bombs and smoke flares which have the Smoke effect, but once again, no smoke grenade. Even the weapons table in IH does not list a smoke grenade. But until RT, I don't think there was a "Smoke" grenade.
Not sure if that helps any or not...
Oh yeah... Nothing in the compiled weapons table that is in the character sheet either. Don't know why you couldn't make one though.
The Blind Grenade is the smoke grenade, basically. If you want just a pure smoke grenade just re label the Blind Grenade to Smoke Grenade and there you have it. Just ignore the EM and IR dampening of the Blind Grenade.