From Wikepedia:

Modern Day Lavee with the Hot Rock Hearth.

Cannabis was common in Eurasia before the arrival of tobacco, and is known to have been used since at least 5000 BC. Cannabis was not commonly smoked directly until the advent of tobacco in the 16th century. Before this cannabis and numerous other plants were vaporized on hot rocks or charcoal, burned as incense or in vessels and censers and inhaled indirectly. Evidence of direct smoking before the 16th century is contentious, with pipes thought to have been used to smoke cannabis dated to the 10th to 12th centuries found in Southeastern Africa

We are back to vaporizing Cannabis similarily to how it was done 5000 years ago.

My Grandmother from Lithuania said " My Grandfather would go into the Forest where the Wild People would kill you and crush Mungus between hot rocks in skin tents.``  

WERE CRIMES COMMITTED BY PERSONS EMBOLDENED BECAUSE THE "ILLEGAL" DESIGNATION OF MARIJUANA PRODUCTION AND PRODUCERS DISENFRANCHISED GROWERS AND DEALERS

THAT INJUSTICE IS ANOTHER RESULT OF POLICE PREOCCUPATION WITH THE ENFORCEMENT OF LAWS AGAINST HONEST PEOPLE WORKING TO  PRODUCE AND DISTRIBUTE MARIJUANA.

I HAVE WRITTEN EXTENSIVELY IN "MARIJUANA WARS" ABOUT EXTORTION. I AM SURE EVERYONE KNOWS ABOUT RIPOFF ARTISTS AND BURGLAR THEFT.

I generated a backlash when I said that there was a matter of an illegal collusion by Dispensaries if they communicated with each other or coordinated in any way or even acted independently simultaneously when Marijuana prices dropped precipitously by 40% to 50% without the securing of a known and negotiated new pricing regime from the suppliers of Marijuana. Competition and Marketing Practices Regulations still apply, the violation of regulation through supplying Marijuana is a separate issue.