Most products we encounter are designed to make us want to use them, to influence our behavior in a way that involves using it more. These aren't all bad -- things like fuel economy feedback are great positive behavior influencers -- but it's not often we see something that is designed to make you stop using it.
Roughly akin to getting handed the keys to an SUV on your way out of An Inconvenient Truth, the cheeky Lung Ashtray might make smokers think twice about what they're putting in their lungs. Would it make you think twice? ::Lung Ashtray via ::Core77