Can everybody quit smoking cold turkey?

I know that nicotine is one of the most addictive substances in the world and people have a really tough time stopping smoking. On the other hand some people testify that they have stopped smoking cold turkey without any effort. What is the factor for the addiction? Is it the amount of time that the person smokes? Is it a biological thing where it only works for some people? Or is it a mind thing; simply a bad habit that people don’t have the will power to stop?