You might be a stoner if you get high before every meal just so it will taste that much better...
You might be a stoner if your roommate also happens to be your dealer...
You might be a stoner if all of your stories of crazy things happening to you and your friends start out with the phrase "We were all really high and ...."
You might be a stoner if you've mastered the art of rolling a joint while driving with your knee.
You might be a stoner if you've got visine on your person.
You might be a stoner if you've specifically arranged the furniture in your bedroom so you can sit and smoke by the window comfortably.