I really don't think so. I think it's a psychological thing. Cig smokers hav had the "it's more addictive than cocaine and heroin" shoved down their throat for so long they've started to believe they have to have help in quitting.
And I don't think pot is addictive either, but that's just my personal opinion. I have no science to prove the statement one way or the other.
I am not sure about the 'more addictive than cocain and heroin' stuff, but I do notice that many former cocain and heroin addicts continue to not be able to quit smoking after quitting the other drugs. But thats just what I have observed and have never seen any scientific study on the matter.