Stop it. You're "freshening" nothing. You're making your car smell like an auto parts shop or a K-Mart. There is nothing fresh about the smell of car air fresheners. They smell like stale perfume, regardless of the "flavor".
And, I wouldn't care if the smell stayed inside your car. The thing is, the weather this week meant we're all driving around with our windows open, and I can smell your air freshener if you're 3 cars in front of me. I'm enjoying the beautiful, crisp, actually fresh air and then I get in the wake of your stupid Vanillaroma leaf and my idyllic early summer enjoyment is ruined. Thanks a lot.
Can't you people smell how nasty these things are? I'd rather have car mildew than this. If you do have car mildew, stop trying to outdo it with a stronger, nastier smell, and get it cleaned, or air the car out. Geez.