It certainly is possible to do that. All you need is a campaign that breaks even or makes a profit. In other words, you just need a break-even or positive ROI.
To have a positive ROI you need a website that converts well, a nice profit margin on your product/service, and a well-optimized campaign. If you already have those things then you are ready to go.
To give you specific advice we need the following information from you:
- What is your current average conversion rate?
- What is your profit margin?
- How long have you been optimizing your current AdWords campaign?
- What is the average CPC for your current campaigns?