SPECIAL GRENADES...
FLASH GRENADE...This will temporarily blind and deafen anyone nearby facing it when it bursts, INCLUDING YOURSELF, so be sure not to throw it too close. You can turn your back to it or get behind cover to avoid being blinded. Also, it will temporarily disable a Sentry Gun.
You get two of them, & they can be replenished with the Scavenger perk.
STUN GRENADE...It will slow down a target for several seconds, or YOU if you don't throw it far enough. If stunned, try to shoot in the direction you think it came from; maybe you'll catch the enemy with his pants down. You get two of'em; like all other grenades, they are replenished with the Scavenger perk.
SMOKE GRENADE...Just what it says! A thermal scope can see thru its smoke, but not the naked eye, and it's not a weapon, its smoke is not poisonous. Its uses should be self-explanatory. You get one at a time.
I come from a smart family...In the Civil War, my great-grandpa fought for the WEST.