Yet another review weighs in to dispel hype and marketing from the huge cannabis industry.
The conclusion is: There is reasonable evidence that cannabinoids improve nausea and vomiting after chemotherapy. They might improve spasticity (primarily in multiple sclerosis). There is some uncertainty about whether cannabinoids improve pain, but if they do, it is neuropathic pain and the benefit is likely small. Adverse effects are very common, meaning benefits would need to be considerable to warrant trials of therapy.
No matter, the anecdotal based evidence will continue to be pushed by vested interests.