Engaging the Senses

Two of my writing mentors - Jonathan Maberry and Kelly Simmons - have reminded me that long-form fiction should include examples of all five senses being engaged.  It's not enough for the characters in a novel to see, to hear, and to touch.  They should (at least once) smell and taste.

In fact, Maberry does a final edit of his novels in which he makes sure there are instances in which characters (or at least the protagonist) smells and tastes something.

At present, I'm turning an old, unsold screenplay I wrote into a YA novel.  (That's Young Adult.)  I'm trying to add smells and tastes as I go along.

It's not as easy as it sounds.