Yes, but there are conditions:
- this must be a blog with real content that can generate traffic rentention (blogs filled with banners and sales pitch look like spam and don't make sales)
- you must host your blog on your own domain - urls like johnny763xd.freesuperblogs.com will make your blog look too amateurish to create confidence and make any serious sales
- your post titles and bodies must include keywords and must be appealing, without overdoing it.
Most importantly, you will need to work on your blog, writing posts regularly, in order to develop a consequent group of readers who will trust you enough to buy from your blog.