Smoke Bomb Feat 2
Source Pathfinder Player Core 2
You can add a tarry additive to an alchemical bomb to make it emit smoke. When thrown, in addition to its normal effects, the bomb creates a cloud of smoke in a 10-foot burst. You choose which corner of the target's space (or the space in which the bomb lands) the cloud is centered on. Creatures within that area have the Concealed condition, and all other creatures are concealed to them. The smoke lasts for 1 minute or until dissipated by a strong wind.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AdditiveFeats with the additive trait allow you to add special substances to alchemical consumables you create when you use Quick Alchemy to create a consumable (you can't use additives with quick vials). You can add only one additive to a single alchemical item, you can add an additive only once per round, and most additive abilities specify a subset of alchemical consumables you can add them to.
AlchemistThis indicates abilities from the alchemist class.