bullshit. i've been smoking cigars for 5 years now. sometimes 2 or 3 a day and have zero issues stopping or going without a smoke for months. i was surprised as i was never smoker, but it is what it is. nicotine addiction is not nicotine addiction but cigarette addiction. cigars are pure tobacco. nothing else. cigarettes have over thousand ingredients in them. cigars also have higher nicotine dose than cigarettes and as i have said, zero issues.
as i said, nictoine is a non-factor. as for caffeine, i quit multiple times. once the headaches are gone, which takes a week or two, followed by another week, or few, of feeling lethargic, it is back to normal(ie. give it a month altogether). so it's not too bad. it might be also easier to wean off slowly by decreasing caffeine consumption over longer period than quitting cold turkey to avoid the negative effects altogether.
know thy enemy.