Eric Goode, PhD, Professor Emeritus of Sociology at Stonybrook State University of New York, stated in his June 1970 book The Marijuana Smokers:

“A significant proportion of marijuana users did not become high the first time that they smoked the drug … In part, much of this may be attributed to improper and inefficient technique. However, even with the most careful instruction and technique, some fail to become intoxicated.”

June 1970