How many cigarettes is 5 nicotine equal to?

Excuse me, I'm curious about a comparison I've been thinking about. Could you please explain, if it's possible, how much nicotine in cigarettes would be equivalent to a dosage of 5 nicotine units? I'm interested in understanding the correlation between nicotine consumption in cigarettes and other forms of nicotine delivery. Could you provide an estimate or a range, perhaps taking into account factors like cigarette strength and brand variations?