From the Uncyclopedia:
Kitten huffing is a controversial practice that has recently been growing as a popular and healthy alternative to street drugs. Despite a long history in Western culture, the practice remains largely taboo. Excessive huffing has been known to produce undesirable side effects, including addiction, damaged sinuses, corrupted brains, which may lead to someone thinking they're something they aren't, and, in some cases, death. It is a general rule of thumb that anyone who huffs more then 3 kittens a day is an addict. Veteran huffers often caution against huffing more than a couple kittens per day as overdosing can be very unpleasant and quite dangerous.
Jimmy spent all night last night kitten huffing... he doesn't have eyes any more.
A relatively healthy alternative to Street Drugs. The most popular method of kitten ingestion, the "cupped hands" aproach, involves cupping one's hands around the kitten's head, and inhaling deeply through an opening in the hands, effectively sucking out the kitten's soul. Some huffers prefer huffing using plastic tubes or kitten huffing bowls.
I think I'm addicted to Kitten Huffing, I go through a couple litters a day.