I like the slightly stale smell of a large body of water. Sort of like the watery freshness plus all the seaweed flora, some dead some alive, combine into the smell of adventure.
Tobacco smoke, but only when it is someone else who's smoking.
Tea tree oil is just great.
For years, ever since my childhood, I would catch a whiff of this very sweet, fruity, ethereal smell on the wind--almost like if a smell could be "malted." It would show up randomly and in an instant it would be gone. Years later (when I was like 20) I would learn that this smell came from Black N Milds lol
Also I love the smell of certain high quality printing, like the smell of Pokemon cards. I guess this one is probably linked to the child gambling scheme that is TCG booster packs (perhaps the first loot boxes)