Unclear on the Concept
That evil-smelling cigar the size of a small log you were smoking and dribbling ash out the window as you drove? It isn't doing Gaia's tender membranes any favors. Plus it makes the person behind you (you remember, making choking motions? Vanity plate that says ISNARK?) question your commitment to the eco-fanatic cause. Perhaps you think a vast fleet of Maxwell's demons determins the origin of each molecule of greenhouse gases (such as cigar effluvia) and only allows those generated by non-hybrid cars to affect the environment? Or maybe you think you are special.
And yes, I could smell it even though all my windows were rolled up. They don't design automotive air filters for chemical warfare environments. Unfortunately.