Ladies and gentlemen he's 17.

Not really anything you're going to notice. I suppose if you vaped out a whole room a non vaper could detect a whiff of something...

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What makes you ask? I've mixed flavorless for vaping on long trips when I was concerned someone would be offended of smell, or for a stealth vape.

Probably going to depend on the nicotine, age of nicotine, nic %. If it’s straight VG then YES it will taste a bit sweet.

VG is just a bit sweet.

PG tastes bitter and can leave a lingering chemical smell in your nose.

Neither will leave any smell in the room afterwards, but VG sticks to surfaces. The colder it is, the worse it gets. Washes off with soap and water though.

As for nicotine, that depends on the nicotine. Good quality - no smell. Poor or degraded quality can have and leave all sorts of off putting smells, including in the room.

Nic salts have a flavour, sorta hard to describe. Tastes kinda like a slightly toasted chemical, with a vaguely tobacco undertone.

Underage vaping post. Son, I understand your position - at your age I was a pack a day smoker. I encourage you to find another way to relax until you are of legal smoking age in your state, then maybe think long and hard about whether you want to start a fairly expensive addiction. In the meantime, this post is locked.