Petrol/gasoline has a "natural" smell. The chemicals in it produce the smell. Like Matherox said; only things like propane, natural gas and other gases that are colourless, odourless and tasteless have a smell added to them.
Books, both brand new and very old. Jet fuel. My mom was a flight attendant when I was a kid . When laws regarding flying were a LOT looser, I would attend meetings with her at the airport and sometimes fly with her while she worked to see my grandparents in Chicago.
Money and smoke... Not cigarettes, but real tobacco like from a pipe or cigar... I've been told I have expensive taste
I'm not 100% sure what it is, but I think I like the smell of hydraulic fluid. Roller coasters have a tendency to leak the stuff and considering that I only ever come across the smell on a roller coaster, it's a fair assumption.
Other people have said it, but the smell after/during rain, which has a word! "Petrichor". Love it. New car smell actually makes me want to puke. I don't hate it, but for some reason I get nauseous ><
New cars, tea bags, petrol, burning wood and coffee. I could go on forever! EDIT: How could i forget Play Doh!
