Native americans are reputed to use tobacco to drive away bad spirits, and it is true that initially tobacco will give the person a mood lift.
In dreams it is this symbolism of impending change that is meaningful.
Trying to give up smoking in dreams suggests that we are attempting to live without false stimulation.
Tobacco appearing in dreams will have different meanings depending on whether we smoke in waking life or not.
If we do, then tobacco, in the dream, is probably a comfort tool, though nowadays something of a guilty pleasure.
If not, then the symbolism is probably more to do with the idea of using tobacco to achieve a particular state of mind.
If the dreamer is smoking a pipe, there may be issues of masculinity to deal with.