Why do people like to slowly let smoke come out of their mouth?

Whenever I smoke hookah, weed or on my vape, I enjoy slowly letting the smoke float out of my mouth, why is that?

Also, why do people like images of smoke coming out of a person mouth such like this one:

http://24.media.tumblr.com/tumblr_m7vquwCPDZ1rrzzgco1_1280.jpg
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