Only two letters separate coughing from laughing . . .

“What did the cough say to the runny nose?”
“What?”
“Let’s spend the night together.”
(This is about how hard it is to sleep when you’re coughing and sniffling.)

“Why was the kid with the cold denied internet access?”
“Why?”
“Because someone said he had a HACKING COUGH.”

“Who is a sneeze’s favorite Star Wars character?”
“Who?”
“AH-CHOOBACCA.”

“What do you get when you win the SNEEZE OLYMPICS?”
“What?”
“A COLD MEDAL.”