Based on what you have described you need to setup your Variants to have only one option, scent. So on the product page where you setup your Variants, you will want to enter in Scent for option 1. Below is an example of how you will want the options to look:
SKU,Price,Ounces,Stock,Option1Value,Option2Value,Option3Value
Scent1,22.50,8,24,Vanilla,,
Scent2,22.50,8,24,Chamomile,,
etc.