While according to Google there is no algorithmic adjustment or preferential treatment of AdWords advertisers on organic search results, the question posed “Does PPC have any effect on SEO?” In my opinion, the answer is absolutely, yes, and it is based on my own experience. The effect comes specifically from the promotional benefits of advertising.
So, PPC advertising produces traffic from sponsored listings, increases traffic from organic search listings through attribution, and the increased exposure tends to positively influence the natural link building process via increased awareness of your brand and increased exposure of your content.
Also, as a related aside, you can use PPC to quickly find top-performing page title candidates, and top-selling points for your text snippets to use in SEO campaigns. Google uses your organic CTR and other user engagement data to adjust rankings in SERPs. Testing of those key elements using PPC as a testing platform will allow you to quickly find the page titles and text snippets that are going to benefit your organic listing CTR, as well as conversions.