Leaving aside conjectures, the guy is an actor by profession- he is neither a professional singer, nor professional scuba diver nor professional cook. These are again his hobbies.We are all aware that his field of excellence is acting - we are just discussing the multi facets of his personality i.e. were discussing his capabilities and activities he knows or is good in. That is totally different from professional career. In fact there is a marked line of difference between the two.A singing reality show usually has professional singers participating not actors -again everyone knows that. Fear factor I don't think he has registered for it or shown any interest in.So from where did the harmful effects of smoking on his career came I failed to understand?