>... researchers have identified the molecular mechanism activated by the presence of tetrahydrocannabinol (THC)... in the bloodstream that accelerates cancer growth...
sigh, a lot of articles in the past mentionned the positive effects of cannabinoids on tumor growth (slower growth, no metastasis, also apoptosis trigger) so now it's a double edged sword.
Conclusions: Associations with cancer risk or benefits have been claimed for most food ingredients. Many single studies highlight implausibly large effects, even though evidence is weak. Effect sizes shrink in meta-analyses.
In nutrition it's my personal conclusion after roaming pubmed. Any ingredient can be linked to problems or benefits. Eat many, eat few, move often, relax, think, hug and sleep.