If you sift through the article, it describes the reasoning behind it.

Here's an excerpt....

Most customers who purchase the used tissues are "young parents and people in their 20s" who are skeptical of vaccines and seeking "alternatives," according to Niessen.

However, there are no vaccines to combat the common cold. According to the Centers for Disease Control and Prevention (CDC), the best way to protect yourself from the symptoms of a cold — sore throat, runny nose, sneezing and coughing — is to wash your hands often, to stay away from others who are sick, and to avoid touching facial orifices where germs can enter the body