Rain - before it rains, during, and after - three different smells
Apples - Apples on the tree, cider apples, apple pie
Mint - I have a mint garden, so I can tell you 3 different smells of mint - all good
Different trees, plywood, and sawdust
Gasoline
Cigars, pipes
New Books and Old books
Individually the smell of hair spray and ink are really bad - but combined, the smells are really intoxicating.