[ChalkLine]

Nicotine has useful physiological and psychological effect well known for soldiers in combat and post combat environments, offset by a marked increase in the likelihood of emphysema and lung cancer.
However individuals in the Twilight 2000 are subject to comparatively high doses of ionising radiation so may accept that risk. Anyway, I just added that to make sure that everyone know's I'm not encouraging smoking.

Cigarette use can effect COOL rolls, but have a rapid withdrawal effect that also effects COOL rolls. However cigarette use also is highly addictive, at least as addictive as heroin, so individuals using cigarettes are unlikely to stop cigarette use willingly especially given that they offer some relief from the general low key dismal impact of the Twilight 2000 environment.

What do they do?
I see them effecting rolls in two ways. The first way is for short interval situations. An individual who has failed a COOL roll may use a cigarette to either reroll or to shorten the effect of the failed roll. For long interval situations cigarette use can add modifiers to over a period. A good example of modifiers could be a bonus to maintain concentration on a task or being unruffled enough to retry a task. Of course withdrawals gives the individual the same but negative modifiers.

Not all cigarettes are equal. 'Ersatz' cigarettes have little tobacco in them. They cost far less and have a much lesser effect. Pipe tobacco can also have varying amounts of actual tobacco for varying effects on rolls. Industrial cigarettes, known as 'camels' during WW2 regardless of what brand they were, have the standard effect and are considered 'strong' in dosage.

In Germany 1944 an ersatz cigarette was $2 and a camel was $5 and that's a good standard in my opinion.

The other important drug; coffee, was worth $500/kilo!