Was cannabis the first ecommerce sale?

Well this is news to me. From the E-commerce  page at Wikipedia.org:

1971 or 1972: The ARPANET is used to arrange a cannabis sale between students at the Stanford Artificial Intelligence Laboratory and the Massachusetts Institute of Technology, later described as “the seminal act of e-commerce” in John Markoff’s book What the Dormouse Said.

I’ve ordered the book because I really would like to know more about this, and I remember it being mentioned as influential in Walter Isaacson’s The Innovators.

I have read conflicting facts so if you have more info about the first ecommerce purcahse, please share.

Andrew @ EcomLoop
Are you looking to start or grow a standalone ecommerce shop? I help independent businesses achieve success on the Shopify and WooCommerce platforms. As the owner of multiple ecommerce businesses, I've had the opportunity to get experience with nearly every aspect of the ecommerce industry. I started EcomLoop to help other quality independent businesses using my knowledge and experience. To stay on top of new ecommerce developments, I publish The EcomLoop Weekly Loop, a blog and email newsletter with original thoughts and curated links to help independent businesses improve their businesses.