I've started some time ago an Adwords campaign for my site, which contain also Adsense advertising. The problems is, for the same number of clicks on Adsense texts, the revenues are less than before the AdWords campaign when the visitors come from search engines or backlinks. For example before the AdWords campaign I earn 1$ from 5 clicks and now when the AdWords campaign is active, I earn only 0,3$ from 5 clicks. Anybody knows what is the reason ?