How do you know which ones have alcohol? The peach really smelled up my room while it had the lid off and Im hoping I didnt evaporate all of the good flavor out of it

It just really tastes odd now. Which is why I am curious about how long to leave the lid off, or even if I really need to.
I'm going through the same learning process about steeping. I'll read a thread about various steeping procedures that different people use, and for different amounts of time, then read some other threads where people just got their juice in the mail that day and say they taste "great!" Or I'll watch a video where someone mixes their own DIY juice, gives it a good shake, then puts it in their rig and vapes it and says it's great. That really makes me wonder what's going on.
I've seen a few posts with what Taylon said, that some flavorings have alcohol in them and it needs to evaporate off.
Also I've seen where the nicotine needs to oxidize to mellow it out or it will burn some peoples throats, nose, and/or mouths. Leaving the lids off helps this process, too.
Then there is the flavor enhancement gained by letting juice sit for, from what I've read, anywhere between 2 days to 6 or 8 weeks. This part seems to depend on the exact flavorings used, and probably even which company makes them as there are different methods used to get the different flavoring types for the same original source items.
So anyhow, did your room smell like peaches, or something else?