Explain the meaning of a "smokescreen" in literature.
There is no play that you listed, but this might be ok, since smokescreens function in the same way irrespective of context. Smokescreens function to veil or hide something from a person or group of people. The goal of smokescreen, then, are to deceive. They can also be more pernicious, because it might not hide truth, but bend truth and tweak it a little here or a little there. The best lies, keep in mind, are the ones that are mostly true. In this way, people won't be able to tell what is true and false. Smokescreens are great at doing this.
A smokescreen hides what lies behind. Period.
In the play "Smokescreen" written by David Craig, both the father and the son hide behind their excuses (smokescreens) and show no concern for each other's real needs. Lacking empathy, both worry about their own needs, and hold onto their corners, which in fact become their own jails.
Moral: When we make excuses (smokescreens) to conceal that what really interests or concerns us, we are not in fact helping ourselves but hurting.