That's a Pretty Funny Answer!

Cam and Stuart were riding to school on Tuesday when they had to pause for a train. While waiting they saw two trucks loaded down with tobacco. Having helped his grandfather with the hanging of tobacco years before, Stuart wanted to wax nostalgic with Cam and pointed out the tobacco on the back of the trucks.
"What's tobacco?" Cam inquired.
"It's a plant that they grow in Kentucky."
"What's it used for?" he pressed.
"Well...people make cigarettes out of it" Stuart replied.
"What's a cigarette?" Cam asked.
Oh, boy, "Cam Cigarettes are things that people smoke. But we don't want to do that because it makes your teeth yellow, your breath smells bad and it can even kill you."
"How does it kill you?" the inquisitive one responded.
"Well...God made all of the parts on the inside of you to work together. All the parts have to work together for you to live. Cigarettes can cause cancer which is a disease that grows inside of you and can keep some of your parts from working and you could die."
"What do cigarettes look like?"
"They're white sticks that people carry in their mouth."
"Oh, man. Like half the people have those. Why would people want to smoke a cigarette?"
"I really don't know Cam."
[Silence]
Cam breaks the silence, "Maybe people smoke cigarettes because they want to die. {giggles} that's a pretty funny answer"