When people hear the term "subliminal advertising" they always assocciate it with the 1/4 second long images you hear about, this isn't the case. Most, if not all advertising is subliminal, see any advert on TV and everything will place placed in a such a way it appeals to the audience, mixtures of colours, sounds, anything. On the consious level it may not effect you, on a sub-concious if definitely does, you can deny it and say "advertising doesn't effect me" all you like, chances are it does, you just don't know. See an advert for Coca Cola think "What's the point in them advertising, everyone knows about their product", few days later maybe you need to choose between Coke and Pepsi, assuming you are neutral in the Coke v. Pepsi debate chances are you'll go for the former, completely unaware. A recent one I've noticed is all these adverts that use 70s/80s songs, you see it alot, come to associate that song with that advert, maybe hear that song on a radio a while later and "randomly" get the urge for what ever the advert was.
Subliminal advertising is a powerful force, don't even try to fight it, you can't, unless you force yourself to only by "no frills" products, and even then you'll be influenced over which shop to buy them from.