Well seeing as it is so very easy to accidentally click on ads particularly if you use a trackpad or they are designed to deliberately catch you out, click through rate may not always be that relevant. However apposite ads such as for cigars on a cigar review site or bikes on a bike review site are certainly going to get deliberate click throughs as they are the people who want to buy that product, so they make perfect sense.
The Google ads that advertise what you have already bought or searched out or even simply glanced once by mistake a month ago however are simply irritating. And Adsense ads can be very inappropriate at times too with a car ad appearing on an anti car blog say. Ads do make Google a fortune though.
So do the ads make decent money for your cigar site then, as that's where they should work very well.