No, there is no cause for concern.

I did a Ph.D. on the use of preattentive perception (read "subliminal") on just-in-time memory support. This was the "Memory Glasses" project that got a bunch of media attention a few years ago -- you may have even seen me pitching it to Alan Alada on PBS's Scientific American Frontiers "you can make it on your own" episode.

The long and short of it is that, yes -- properly encoded, "subliminal messages" can jog your memory, but no, they don't otherwise work as sug,gestions or influence your behavior. If you're curious, you can actually read my dissertation on the Memory Glasses and find out more.

There was a lot of hype in the 70's and 80's about the evils of subliminal marketing, but it was all based on junk science with forged data.