Smokers in general...but the worst is smokers who just drop their butt wherever they happen to finish it. Which is ALL of them.
Think about how much of an asshole you have to be to suck cancerous smoke into your lungs and blow it back out so everyone else can breath it. It's not too much of a stretch to be a litterbug after that.
A cigarette takes 10 years to bio-degrade.
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