Cigars may be cigars, but jokes are never just jokes. What do you mean?

Joke is a form of psychological catharsis, which can avoid making our psychology excessively depressed. In other words, jokes can help us deal with those factors that make us feel uneasy. The simple act of telling a joke or laughing at a joke can reveal a lot of subconscious information, so we say, "A cigar may be just a cigar, but a joke is never just a joke."