A new category for cigars would be useless, you could make it that way that it increases your booster cooldown but what would it give you in return? We already have nerve. Giving energy would be broken and giving happiness might be an option, just like edvds and candy but you would need to find a was/an amount that wouldn‘t break the market and that still has an use.
They way you mentioned it (which is a bad usggestion itself because it isn‘t fleshed out enough), giving nerve in return for the booster cooldown increase is basically just a copy of beer. We don‘t need another nerve item. Normal beer is piss cheap and does it‘s job and the high nerve beers can get expensive relatively quickly and give a nice amount of nerve if you take 24 of them per day.
If you still want i to give nerve, you would have to come up with a plan for it, how it would have an use (idk maybe a premium nerve item comparable to SE‘s which give a ton of nerve and have some use for the ones which are really high up in CE and NNB) and here again, how it should be done in order for it to not crash the beer market.
Edit:
TL;DR:
Adding cigarettes as a new nerve item would be pointless since beer already fills that role well. A new category like cigars would only make sense if it offered something unique (e.g. happiness), without breaking the market. If it’s meant to boost nerve, it needs a well thought out concept, perhaps as a premium item for high-end players, so it doesn’t make existing items like beer useless and doesn‘t break the market.