Further, I am against the idea that smoking should give you any kind of stat bonus. It makes no sense to me. And while withdrawal symptoms could make sense I am not sure if it's really worth it. I don't see how adding withdrawal symptoms would benefit RP. I believe that the main purpose for them being there for drugs to provide balance.
Lastly, I -believe- that it is the 'ht' command that will show the impact cigarettes have on your character and if it is, it is not super obvious. Not 100%sure though.
Slither already asked me about doing this and I am fine with like giving nicotine a little of a boost, but I'm probably gonna settle on like literally +1 to a substat, which will do approximately nothing for you in the grand scheme of things, but satisfy the need for people to feel like it's got an effect even if it should just be RP'd.