why does smoking cigarettes suppress your appetite?

Answer 1

I'm not sure why chemically it suppresses, but I do know that psychologically, its another way to satiate an oral fixation. Alot of people who smoke and/or over eat have an oral fixation. The acts of chewing gum, pens, grinding teeth, puffing on a butt, constantly eating are all related. This mental state is also why people who quit smoking often gain weight. They replace that puffing with eating. Its recommended that people who quit should suck on lolly pops instead of turning to the fridge to fill that void of pleasure.

So to answer your question dealing with the psychology of suppressing an appetite...instead of turning to food to fulfill a desire, one turns to the cigarette and therefore doesn't need the food.