Marketing is about incepting or forcing a product into your brain whether you like it or not, so that if you are in a purchasing decision you are oriented towards choosing the one that got there first or is there in front of you first, to whichever degree you are aware of it or not. Whether by allure, or repetition, or product description and explanation, or placement and convenience (including mental availability, familiarity, heuristics, novelty vs comfort seeking, etc.), there will be a method or confluence of methods that works on you. It's not just ads. It will wear you down and you will be influenced in some way or form. You are not immune to propaganda, you are not immune to marketing.
(The example I like to cite is those irritating 5s KFC YouTube ads. They are designed to be irritating to deliberately displace the competition (Hungry Jacks, Red Rooster) both within the advertising space and within your active recall. Then, when you see a KFC ad in other locations you think of that irritating ad and it reinforces those neural pathways, further cementing it in your brain and locking out competitors whether you buy from KFC or not)