In a rich story world, there will usually be multiple sources of contrast, juxtaposition, and conflict.
Here's a small example from Tom Sawyer, but to understand it, you need a little context.
There are three boys: Tom, Joe, and Huck.
Before the snippet below, Tom has suggested that he and Joe should learn to smoke, and Huck has carved pipes for them from corn cobs.
The snippet shows them beginning to smoke and thinking everything is going fine. We then jump ahead by about a page [...] to find Tom and Joe have become violently ill (the fountains and pumps are metaphors for sweating and vomiting).
Given that context, what are the areas of conflict in this snippet?