Highlight: "Wikipedia summarizes Guillem et al 2005 as "Technically, nicotine is not significantly addictive, as nicotine administered alone does not produce significant reinforcing properties" - the addictiveness coming from MAOIs (eg. Khalil et al 2000, Khalil et al 2006) & possibly other compounds present in tobacco"
So I'd expect cigars and pipe smoking to be addictive. My personal experience is smoking cigarettes occasionally (average less than one a day), and I wouldn't say I was addicted either.
My current hypothesis for why cigarettes seem more addictive is frequency. Searching "cigarettes per day average" turns up estimates mostly around 15 per day; most cigar/pipe smokers aren't anywhere near that.
(Disclaimer: I am not a doctor or scientist.)