While cigarette filters only provide "comfort" for smokers and allow them to be less irritated by the smoke they inhale, they do not retain any of the thousands of chemical and toxic molecules that make up tobacco smoke
Low-concentration nicotine (1001,000 nM) has a regulatory effect on anorexic POMC neurons, NPY neurons, and secretin/orexin neurons in the hypothalamus, and can mediate neuropeptide Y, leptin, orexin and its receptors and uncoupling proteins, as well as the level and activity of neurotransmitters such as dopamine and monoamine, with the effect of controlling food intake and reducing obesity ( Secondly, nicotine can reduce the size of fat cells and fat content by regulating fat decomposition and synthesis, and it can also raise the heat production of brown fat and transfer fat storage from adipose tissue to muscle utilization
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Excerpt from "The Box: How the Shipping Container Made the World Smaller and the World Economy Bigger", Marc Levinson, Princeton University Press, 2006