1. But its active ingredient, tetrahydrocannabinol, is hard to make.

2. The active ingredient, tetrahydrocannabinol ( THC ), makes up 10 - 15 % of hashish.

3. The basic and clinical pharmacokinetic research data of tetrahydrocannabinol in recent years were reviewed.

4. Brain cells have a receptor for THC (tetrahydrocannabinol), which is the active ingredient in marijuana.

5. Tetrahydrocannabinol or THC in its abbreviated form is the substance found in marijuana.

6. A capillary GC method for the simultaneous determination of cannabidiol(CBD), tetrahydrocannabinol (THC), and cannabinol(CBN) in cannabis is described.

7. HPLC-UV, HPLC-ELSD and GC-FID methods were used to determine tetrahydrocannabinol and cannabidiol in different growing period of hemp.