Have you even used Incendiary Grenade? Incendiary Grenade needs to be placed right beside or under your target to deal its maximum 170 damage, so that its burn damage will finish off the target. Smoke can land a full arm's length from a Guardian and it will [i]still[/i] slow, damage, and blind them. Even after they've left the smoke, the toxin will keep damaging them. Smoke also explodes on impact, can stick to targets to deal additional damage, and can be used [i]anywhere[/i] at [i]any[/i] time to great effect. Incendiary Grenade actually requires accuracy to be useful, and it cannot be used effectively in as many situations as Smoke. If Smoke demanded as much accuracy and effort in its use as Incendiary Grenade does, then there'd be no issue, but as it stands it slows, blinds, damages, and suppresses evasive abilities all for just tagging someone with it, and it can be used every half-minute - all at the low cost of using your Melee ability.