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Sometime later this year (2017) Google will stop snooping through your emails to provide "better" advertising and offer profile settings to control what advertising you will see with options to choose what you like and what you don't like. They'll still be watching for Malware and Viruses but ad content shown will be according to your user profile instead.
 
 

If you are signed in, you will (currently) see options like this...
(click on the image to go to the page)

Google Ad Customization

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