It's no big deal, google does the same thing, it can tell your general area and targets the ads to that. same thing with what you are seeing.
And fyi, EVERY website can see your ip address....thats how you can communicate back and forth online. Ive long since lost the link, but there a banner you cna put in your sig, and it will have the ip address in it of whoever is viewing it. No one else can see it, but back in the day it used to freak a lot of people out until they understood the nature of the internet
No reason for stoner paranoia