I buy it as far as actual success rates for quitting being similar for one reason. You can stop at any convenience store and buy a pack of smokes 24 hours a day right in front of cops, go outside and light up in front of anyone. The convenience and social acceptance factor of cigs evens things out.
But you are correct in that not a lot of folks kill someone for personal use tobacco money, at least in the modern era. And no one has ever died from tobacco withdrawal to my understanding.
Freegards