Does Port scanning/listening increase network traffic?

From: Randell D. (you.can.email.me.at.randelld_at_yahoo.com)
Date: 09/29/03 

Date: Mon, 29 Sep 2003 16:38:56 GMT

A (quick?) question: If I sniff packets on my network, I believe I am
listening which leads me to believe that by sniffing packets I am not
increasing network traffic but merely grabbing a copy of existing network
data.

Would this statement be true? 

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