Just thinking back to my childhood, the things/toys other children got had a much bigger affect on me than what was advertised on TV. I think this is a non-issue.
Maybe I overestimate people, but I don't really see how by the time you would be more influenced by ads/media than your peers you haven't figured out that the person creating that ad is paid to sell you that item regardless of their personal feelings, the truth, etc. They're a way to find new things - I never even knew a product like "Power Swabs" existed until I heard their ad. I didn't just buy them, when I got home I looked up their reviews and decided against the purchase.
I've discovered a lot of stuff through ads, honestly mostly through targeted ones online - I don't really think of everything that makes my life better. I don't know how people are narcissistic enough to believe they will independently think of everything they ever want so that they can research a company that makes that. As long as you are cognizant of the motivations of the person creating that advertisement - why live a life afraid of the effect advertising may have on you?