The following articles have some great "smelly" tips for your writing:
Using smells and taste for powerful writing
Listen! Do you smell something?
Using the five senses in your writing
Using smell to improve your fiction
Here is an example of how one stinky smell transported me... (true story)
One Wonderful Smell by Dawn M. Hamsher
There was a smell. It was like rotten cheese mixed with garbage. I caught a whiff of it as I walked past an alley in downtown Charleston (S.C.), heading back to my college campus. I backed up so I could continue breathing it in. Memories flooded back from Italy, where I had lived in the fourth grade.
Trying to eat hard Panini roll hamburgers. Adopting the stray Italian dog, only to find out he already had an Italian family. Laughing to see a goat wander into my friend’s house and then go up their stairs. Being chased by a cow. Living in hotels for months. Eating rum cake every night. Taking the ferry boat to school. Seeing the rocky coast line and scraggy cork trees. Snorkeling in the crystal clear water while watching out for sea urchins. Dipping ants in chocolate and eating them in the school yard. Learning what a Bidet was. Watching my mom carry all the American conveniences in her purse like toilet paper, ketchup, and salad dressing. Having to go to Spain to get my braces and headgear put on. Helping my dad develop photos in his darkroom. Riding in the Riley with its steering wheel on the wrong side. Buying leather and blown glass in the market. Playing Italian Monopoly with my dad every night after the power went off at seven o’clock.
All those memories --from one wonderful smell.