Generally speaking in civilian circles no. Law enforcement and armed forces are in certain situations.
If the smoke grenade operates on impact, then yes. However, it is a bad tactical idea, because if you have the desire to use a smoke grenade, then you are in the situation where you have enough time to pull one out.
Best venture I could give you is dry ice.
No, your paintballing smoke grenade will not work if left outside overnight in the rain.
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Maybe. It will depend on the type of grenade, how big and what it is designed to do. A smoke grenade will simply surround you with a cloud of smoke. A fragmentation grenade will send shrapnel in all directions, if they don't hit a major blood vessel or major organ, you can survive.
You haven't provided enough detail. It certainly is legal if not smoking is a condition of employment.
A white phosphorous smoke grenade.
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Maximum=4. 1 HE Grenade, 1 Smoke Grenade and 2 Flashbangs.
Hmm...Never head that. I suppose the only reason for that would be that the chemical reaction that produces the smoke releases heat which could combust dry vegetation and start a fire. This probably is a secondary issue on a battlefield, where the concealment a smoke grenade can give you can save your life, but on an exercise or training mission in peacetime, I can see why commanders would make this prohibition regarding smoke grenade use around vegetation.
Both the M8 and M18 smoke grenades used by the US Military generate enough heat to ignite dry grass and leaves. While they do not generate the heat of a White Phosphorus grenade, they can start a fire. The Field Manual for grenades specifically warns of the fire hazard.
They're not released for public sale.