How much nicotine is potentially delivered per cigarette and what is the daily dosage below which withdrawal symptoms develop?

No answer.: Nicotine delivery per cigarette varies with brand, filter, length of the inhaled draw, and how close to the end it is smoked. There is as much a 10 fold delivery difference with these factors, on average. It is very difficult to compare oral (nicorettes) or nicotine patches, because nicotine is inhaled. Withdrawal sx can begin with a 20% reduction in nicotine dosage.

Nicotine: Nicotine content differs depending on the brand, so does individual tolerance.