How do u explain knowing an smell or a experience , when u never had a chance to acknowledged the presence of?

i think the dna is the most complex compound in our body i believe that we are in marked with and subconsciously the history and information that we may recognize when we contact or a body feels strongly about it makes it attach to our dna, our dna is 99% similar to other maybe that 1 % contains a code inscripted in our dna that works like a subconscious recognizer that our ancestor has ped down to us , and that we may keep updating by learning more about history ...Discuss this idea!!!