“Why did the blonde snort Sweet’N Low?”/“She thought it was Diet Coke.”

Coke is a soft drink that doesn’t have cocaine, but there’s a popular riddle:
 
Q: Why did the blonde snort Nutra-Sweet/Splenda/Sweet’N Low?
A: She thought it was Diet Coke.
 
The Diet Coke joke has been cited in print since at least 1994.
 
 
Google Books
The Jock Joke Book:
Uncensored Sports Humor from the Locker Room
By Chip Laballe
New York, NY: S.P.I. Books
1994
Pg. 166:
Why did the cheerleader snort Nutri-Sweet?
She thought it was diet coke.
 
Google Groups: rec.humor
Canonical List of Blonde Jokes
Belding, Troy C.
2/11/94
(...)
Q:  Why did the blonde snort Nutra-Sweet?
A:  She thought it was diet coke.
 
Google Books
Jokes, Riddles and Wisdom:
The Best Collection Ever
By Roger Kuder
San Jose, CA: ToExcel Press
2000
Pg. 62:
Q: Why did the blonde snort Nutra-Sweet?
A: She thought it was diet “Coke.”
       
Google Books
The Jumbo Book of Blonde Jokes
By Ed Sullivan
Bramhall, Cheshire: Cool Publications Limited
2004
Pg. 36:
Why did the blonde snort Nutra-Sweet?
She thought it was Diet Coke.
 
20 September 2005, The News Press (Fort Myers, FL), “Television turns lens on friends” by Francesca Donlan, pg. E1:
“Why did the anorexic snort “Sweet’N Low?” Melissa asked Deanna. “She thought it was Diet Coke.”
   
Google Books
Celebrity Smackdown:
A Very Rude Joke Book
By Luther Blisset
Lulu Publishing (Lulu.com)
2008
Pg. 119:
Q:Why did Kate Moss snort Sweet & Low?
A: She thought it was Diet Coke.
 
Twitter
Allison Reynolds‏
@allisonr
Q: Why did the blonde snort a sachet of Nutrasweet? A: Because she thought it was diet coke. (@andrewsayer said) <-- ahahahaha

5:29 PM - 8 Sep 2008
 
Twitter
Certified_nut‏
@Certified_nut
Do you know why the blonde snorted Sweet N Low? She thought it was diet Coke!
1:47 PM - 19 Apr 2009
 
Twitter
Jesse‏
@SUGEWHITE_
Why did the anorexic snort Splenda?
She thought it was Diet Coke.
12:14 AM - 12 May 2009
 
Google Books
More One Liners, Jokes and Gags
Compiled by Grant Tucker
London, UK: Biteback Publishing Ltd
2013
Pg. ?:
Why did the blonde snort Splenda? She thought it was diet coke.
 
Reddit—Jokes
Why was the blonde snorting Sweet and Low?
submitted May 14, 2017 by OhAces
She thought it was diet coke.