There are lies and there are damned lies and that writer is guilty of the latter.
The Journal of Clinical Investigation would beg to differ with her stretch of mere scientific "suggestions". It has been proven that THC directly affects cancer cells by causing cancer cell death.
Cannabinoid action induces autophagy-mediated cell death through stimulation of ER stress in human glioma cells
For those not scientifically minded, a simpler article is
here