Mike Deeringer on AdSense blog —”We understand that our publishers are always looking for ways to attract interested users to their sites. But using third-party tools or services to increase your site traffic may lead to invalid clicks or impressions and result in your account being disabled. For this reason, we'd like to provide you with some guidance about this.”
As many of you already know, our program policies strictly prohibit any means of artificially generating ad impressions or clicks, including third-party services such as paid-to-click, paid-to-surf, auto-surf, and click-exchange programs. These programs offer incentives for users to view web pages or click on ads, resulting in activity that is harmful to our advertisers.
We occasionally receive questions from publishers interested in using traffic exchanges to bring traffic to their site. While these services may help advertise your site, we don't recommend using them, as they may also result in similar invalid activity. We realize that you may have questions about a specific traffic service and whether it could potentially create invalid impressions or clicks. However, please understand that we're unable to comment on any particular third-party service.
As a parting note, we encourage you to read through our tips and guidelines and Webmaster Guidelines to help keep your account in good standing. These guidelines advise publishers to "Provide unique and relevant content that gives users a reason to visit your site first," and we feel this is ultimately the best way to attract more visitors to your site and build a truly loyal audience.
Source:→ AdSense BlogGoogle, AdSense, Note, Traffic, Exchange, Porgrams, Program Policies