This trap is the same size and has the same radius as a normal bomb.
When triggered the Stink Bomb releases an unbearable green gas which stays for (lets say) 20 seconds.
Attacking troops who run into this gascloud will immediately turn the other way. This does not effect golems and skeletons since they can't smell. Nor does it effect goblins cause they stink so much that they're immume to stench.
The gascloud is highly flammable and when lit on fire by; for example a mortar, an inferno tower, a dragonsbreath or simply another bomb, the cloud will ignite and deal high explosive damage.