Possible tweaks to Graves kit

So I've been playing Graves for a while now and noticed that Smoke screen is pretty useless. The slow is nothing to mention and the reduced sight is nullified with two steps in any direction. So I suggest increasing the AoE and making it tear gas or a poison or something that does damage over time. Or possibly a blast grenade that embeds shrapnel that causes bleed damage. Also since he's so mana heavy maybe lowering the cost and or cooldown of Quickdraw to make it useable at early levels. Just curious what others think about this.