A snake uses its forked tongue to collect scents and then flicks them into the Jacobson's organ on the roof of the mouth.
The olfactory receptors at the back of the nasal chamber.
Snakes use their tongue to smell. tongue collect smell particles from air and tongue places the collected particles in a receptor at back of the mouth to analize the smell.
They smell with their tongues
While a snake's forked tongue looks dangerous, it really is not. Snakes actually smell with their tongues. If snakes bite, they use their teeth
Poo and Pee
Snakes breath through nostrils like you and me, but if you mean how do they smell, then the snake's sense of smell is in it's tongue, which is why snakes flick their tongues a lot.
Snake poop typically has a strong, unpleasant odor, but it doesn't smell like mothballs. The odor is more reminiscent of the smell of decay due to the diet of the snake, which often consists of rodents and other prey. Mothballs have a distinct chemical scent from the substances used to make them, such as naphthalene or paradichlorobenzene, which is not present in snake feces.
When a snake flicks its tongue, it is essentially "tasting" the air. Various chemicals are picked up by the appendage that inform the snake of things like atmospheric conditions and the general direction of prey.
Snakes use their forked tongues to collect scent particles from the air and transfer them to the vomeronasal organ in the roof of their mouth. This organ helps them detect and "smell" their surroundings by analyzing chemical cues.
I wasn't aware that snakes have a distinct smell, maybe you need a good bath :P
the Jacobson's organ
Cucumbers, but only when it's startled.