Sort of ... it's not really smelling but they do detect chemicals in the air around them.
In actuality, slugs do not have four noses. What people perceive as four noses on slugs are really two pairs of tentacles.
Slugs can communicate through tentacles and chemicals. Snails have two tentacles on their heads which they use to communicate with each other through touch. Slugs leave behind a chemical trail which can be processed by other slugs.
jelly fish are capable of smell and taste by its tentacles
Tentacles on snails are sensory organs. They use them to feel around their environment. Also, the largest pair (or only pair, on those species that only have two tentacles) have a light-sensitive patch on them (sometimes at the tip, sometimes at the base)... the "eyes" of the snail. There are also olfactory sense cells (sense of smell) on the tentacles.
Cephalopods use their tentacles mainly to catch food.
Pond snails are a type of gastropod (literally, "stomach foot"). They use their prominent tentacles located on their heads to detect smells in their surroundings.
Octopi's sense of smell is detected through the suckers on their tentacles.
They use them to capture food.
they use the tentacles to grab dirt out of the water and bring it to their mouths.
A black scaly bug that has tentacles is known as a black turpentine beetle. These beetles use their tentacles as sensory organs.
catch a squid the use its sticky tentacles to grab the chest catch a squid the use its sticky tentacles to grab the chest catch a squid the use its sticky tentacles to grab the chest
Their tentacles.