Duplicate Content using WP-Paginate

I’m using the WP-Paginate plugin for a while now. The description says:

“it has also been widely reported that pagination increases the SEO of your site by providing more links to your content”

At this moment I’ve blocked robots for crawling my paginated comment pages becouse i’m afraid for ‘duplicate content’

for example:

http://www.website.com/article.html/comment-page-1/#comment-3320

has the same content as:

http://www.website.com/article.html/comment-page-1/#comment-3322

Question: What’s the risk, and how to solve this ‘ duplicate content’ issue ?

Thanks in advance.