From what I`ve been able to determine, many of our big stars are addicted to tobacco. They want to smoke in movies for the same reason I smoked as I wrote, which is that they think their performance is going to be better.
From a writing point of view, you now have teams of screenwriters working with a director. What`s lost in the process is the power of that one heart, brain, gut and soul that makes something an original piece of writing.