New to vaping and I love it, I had just bought my Ego U and I enjoy it a lot and I have this question about it. When I press the button to turn it on and start inhaling it makes a sucking sound, it can be I guess compared to the snap, crackle, pop sound but I feel like it is mainly a sucking sound, you can hear the sound mainly from the mouthpiece like it is blowing out or sucking in air but it does sound like a crackle noise so I don't know if this is normal?. So I am wondering if this is just the sound of vaping because its not the battery when I turn it on by itself.