Glad to know I’m not the only one.
You know how if you chop onions on a cutting board, everything else chopped on the board develops an onion-y flavor?
I like apple slices that taste faintly of onion.
I like the smell of wood and sawdust. Walking through Home Depot always makes me happy, and I love it when people come through my line at work with craft wood. I also like the smell of the craft foam sheets we sell at work, and the papery, chemical-y smell that comes out when you first open one of the paper decorative boxes we sell. Mmm, Chinese factory air. 
Cigars - smoked by others. My dad smoked them, and the smell reminds me of him. (No, I could never endure the suffocation of actually smoking one of those damned things.)
As others have mentioned, road asphalt and roofing tar have an odd attraction, as does light skunk odor.
There’s a certain kind of dreary, cold overcast morning that feels oddly comforting - no, it’s not just me that feels under the weather, even the weather get that way sometimes.
Hate the smell of asphalt.
Kinda like the smell of chlorine in pools, and love the smell of wax on wood and leather.
ETA: cow shit on damp fields. And fresh pipe tobacco.
I LOVE that smell of gasoline at the station. No, I’ve never gotten high off of gas fumes. 
Also: Any fruity candies. Whenever I’m eating starburst I have to sniff each piece before reluctantly eating it.
You must like apple chutney.
Wet dog. Nothing better in the whole world than the cedar chip/hamstery odor of wet dog.
I know exactly what you’re talking about! My cat was short-haired, though. I used to smell the top of her head or the back of her neck. I just loved the smell of her warm, clean fur.
It’s not the same with the two cats I have now.
Creosote treated docks.
If you don’t know what I mean, the piers and planking of old dock wood was treated with creosote, a kind of thick tar.
Up until I was 5 years old I lived in a company lumber mill town, down on the river. The smell of creosote on a wet dock is like an instant 50 year time machine for me. Evokes memories long forgotten. I wouldn’t even think that I have any memories of such a young age. But one smell and I see and remember.
Creosote, nasty, probably cancer causing shit. Or a one whiff time machine.
I’ve never had it!
But now I want it.
I doubt you can find it anymore, but the smell of freshly mimeographed papers. Tthere’s a scene in a popular 80s movie where the instructor passes out a bunch of papers and all of the kids hold them to their noses and take a big sniff. (the name is escaping me right now, it had Phoebe Cates with that famous pool scene?). Lumber (childhood memories, my dad had a construction company), and the slightly oily, cement-y smell of a warehouse or car repair place (more childhood and teenhood memories, I spent a lot of time working on cars and helping boyfriends and my dad work on cars). And one of my jobs, around 15 years ago, part of my duties were to run and completely reorganize and clean two old warehouses (I got to learn to drive a forklift!) 
Petrichor. I cannot believe nobody said it: its the smell of wet earth after it rains.
Also the ‘invisible’ tape that is used on gift wrapping.
I love the musky scent of my wife’s unwashed (not stinky, just not scoured clean by perfumed soaps) body - and her urine has the same musk. I don’t rush into the bathroom after she has used the toilet, but I enjoy walking past…
Fast Times at Ridgemont High?
Oooh, and I love the smell of car repairs.
Yep, and I second the chlorinated swimming pool. In fact, just about any smell that evokes summer makes me happy.
Gasoline, oil and the ozone smell (I think that’s what it is) from some electrical equipment.
I like to huff the bag that the Wint-O-Green lifesavers were in.
Yes! Fast Times at Ridgemont High!
I like the smell of American money - any kind of bills. The newer the better.