Enola Gaye smoke grenades are designed for paintball and airsoft. These are games that involve ambushes, assaults, tactics, and subterfuge. So why would you want a smoke grenade that burns for a long time? That is what signal smokes are designed for. A real smoke grenade is designed to give you cover real quick! If you are leading a team assault, the last thing you need is to be tapping your foot whilst the smoke cover becomes thick enough for your impending attack.
Burst smoke, pull the pin, chuck it in, show them who is boss.