If you have spent hundreds of dollars on plumbing supplies in your lifetime...And yet you never work on your house's plumbing, you might be a stoner.

If you have ever had to eat half of a joint because it wouldn't stay lit, you might be a stoner. (True Story)

If you had to show your Father what real Lungpower is when you were smoking with him, you might be a stoner.

If you have ever rolled a joint, put it next to your incense burner, then gone digging through your room 10 minutes to find incense, you might be a stoner.
If you have ever done that, then found incense then went tearing through your room another 10 minutes looking for your joint, you might be a stoner.
If you have ever done both of those, then put your incense in the burner and sparked up that joint, only to realize you put the joint in the incense burner and you just took a hit of incense, then you might just be a stoner. (True story from one of my friends)

If you have ever spent three days writing an essay on Marijuana...for fun...you might be a stoner. (Look in the Recreational forum. It's a true story)

If you have ever spent 4 hours listening to "Blueberry Yum Yum" by Ludacris because you forgot to sing along every time...You might be a stoner.