Q. When Did People Start Smoking Marijuana? (Let’s Google It!)

Let’s see what we find:

Yahoo! Answers – How long ago did people start smoking marijuana?

Skeptive – When did humans start smoking marijuana?

Here I decided to change my query to “Marijuana Timeline”

Marijuana Today – Timeline

Medical Marijuana ProCon.Org – Historical Timeline
This is a very thorough timeline of the history of medical marijuana. A fascinating read!

Narconon International – History of marijuana & cannabis use and abuse
They’re against it, but their history is extremely detailed and shows how prevalent the use of marijuana has been over the centuries.

UKCIA.org – A Cannabis Chronology
This one is absolutely fascinating! A must-read for any proponent for legalizing marijuana.