Video exploring critical thinking and how it leads to great citizen involvement

We compiled a table of marijuana potency, 1975-2003 from the Annual Reports (Nov. 9. 1999 to Nov. 8, 2003) of Mahmoud A. ElSohly, PhD, Director of the National Institute on Drug Abuse (NIDA) Marijuana Project at the National Center for Natural Products Research, School of Pharmacy, University of Mississippi. (We obtained these documents from a 2004 Freedom of Information Act request to NIDA.)

The compilations follow. See NIDA's chart in PDF format (107 KB)

Year THC %
1975 .74 %
1976 .72 %
1977 .90 %
1978 1.37 %
1979 1.67 %
1980 2.06 %
1981 2.28 %
1982 3.05 %
1979 3.23 %
1984 3.29 %
1985 2.82 %
1986 2.30 %
1987 2.93 %
1988 3.29 %
1989 3.06 %
Year THC %
1990 3.35 %
1991 3.00 %
1992 3.10 %
1993 3.29 %
1994 3.48 %
1995 3.75 %
1996 4.07 %
1997 4.53 %
1998 4.43 %
1999 4.55 %
2000 4.87 %
2001 5.32 %
2002 6.34 %
2003 6.40 %
AVERAGE 3.85 %

Averages By Decade:

 

Decade THC %
1970's 1.08 %
1980's 2.83 %
1990's 3.76 %
2000's 5.73 %
 

DONATE - Donate to ProCon.org - DONATE
Visit the ProCon.org community on:
Reprinting Policy | How to Cite ProCon.org | Media & Press | Donate to ProCon.org | Disclaimer | Privacy Policy
Debate Topics | State Laws | History of... | Critical Thinking Quotes | Teaching Controversial Issues

© 2015 ProCon.org, a 501(c)(3) nonprofit | 233 Wilshire Blvd., Suite 200, Santa Monica, CA 90401 | Tel: 310-451-9596