This absolutely true.
The poor in America cannot afford nutritional food, healthcare and they live in dire situations. Crime and gangs are rampant amongst poorer neighborhoods which leads to homicide and drug taking, both of which impact on the life expectancy of people.
Little red bumps on your foot that itch really bad.
I know this from experience. I used to have it.
A) For it does not require a life long commitment, and it is not C) because it can be any substance not just tobacco!
Thus your answer is A) gradually but completely withdrawing substances from use !
Have a happy life !
:D <span />