THC Potency Trends

From 1980 to 1997, a total of 35,213 samples of confiscated Cannabis products (Cannabis, hashish, hashish oil) representing more than 7717 tons seized in the United States were analyzed by gas chromatography (GC) (19). The mean THC concentration increased from less than 1.5% in 1980 to 4.2% in 1997. The maximum levels found were 29.9 and 33.1% in marijuana and sinsemilla Cannabis, respectively. Hashish

Table 1 (continued)

Compound

Structure

Main pharmacological characteristics

A-o

Cannabifuran

(CBF)

ho ' '^5^11

X^JyL

Cannabichromanon (CBCN)

f) 0

Cannabicitran

JsVX

(CBT)

r oh

10-0xo-delta-6a-

L/^l/l

tetrahydrocannabinol

X XX

(OTHC)

C" \ 0H

Delta-9-c/s-

Iii

tetrahydrocannabinol

X X X

(cis-THC)

(continued)

and hashish oil showed no particular potency trend. The highest THC concentrations measured were 52.9 and 47.0%, respectively. Two studies performed in Switzerland from 1981 to 1985 (20) and 2002 to 2003 (21) found mean THC concentrations in marijuana samples of 1.4 and 12.9%, respectively. Maximum levels were 4.8 and 28.4%, respectively. Reasons for this enormous increase in potency include progress in breed-

Marijuana Potency

ing, the tendency to cultivate under indoor conditions, and the worldwide access to and exchange of seeds originating from high-THC cultivars via the Internet (22).

Continue reading here: THC in Hemp Seed Products

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