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You can purchase them at specialty retro candy shops, vintage diners, large online candy retailers, and specialty gift stores.

Activated charcoal can absorb odors that pass by it, but only works in a small vicinity and will not be able to remove toxins from the air and just like a sponge when it gets full with water, carbon has the same potential of releasing the odors right back into the environment

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And this might get to the root of the question

[1] In animals and humans, studies show that nicotine reduces appetite and increases metabolism, leading to modest weight loss