Plant cannabis contains more than 60 chemicals.
- chronic pain (including neuropathic pain)
- spasticity (often associated with Multiple Sclerosis)
- nausea and vomiting, particularly in the context of chemotherapy
- anxiety
- sleep disorders
- poor appetite
- fibromyalgia
- post-traumatic stress disorder
- Parkinson's symptoms
- dementia mood problems
- epilepsy
- bladder function
- glaucoma
- Tourette's syndrome
- Huntington's disease
- headache
- depression
- obsessive compulsive disorder
- gut disorders
- curb cancer growth
"There is probably a link in those who start using cannabis at an early age and also if the individual has a genetic predisposition to psychosis. There should be caution with regard to prescription of cannabis for such individuals," says the report.
Also, there is a small dependency rate with cannabis at about 9%, "which needs to be taken seriously but compares to around 32% for tobacco use and 15% for alcohol use".
The evidence for cognitive impairment in long-term users is not clear but "it is wise to be cautious in prescribing cannabis to younger people, given the possible susceptibility of the developing brain", says the report.
Smoking cannabis in a joint rolled with tobacco can make asthma worse and probably increases the risk of lung cancer.
Prof Barnes said: "We analysed over 20,000 scientific and medical reports.
"The results are clear. Cannabis has a medical benefit for a wide range of conditions.
"I believe that with greater research, it has the potential to help with an even greater number of conditions.
"But this research is being stifled by the government's current classification of cannabis as having no medical benefit."
Cannabis is currently classified as a Class B drug, with possession carrying a maximum sentence of five years in jail or an unlimited fine.
Those supplying or producing cannabis face tougher penalties, with a maximum of 14 years in jail.
The drug comes in many different forms - hash is cannabis resin, while marijuana is the dried leaves and flowers of the plant.
A Home Office spokesman said: "There is a substantial body of scientific and medical evidence to show that cannabis is a harmful drug which can damage people's mental and physical health.
"It is important that medicines are thoroughly trialled to ensure they meet rigorous standards before being placed on the market.
"There is a clear regime in place, administered by the Medicines and Healthcare Products Regulatory Agency, to enable medicines, including those containing controlled drugs, to be developed."
About 24 US states, Canada, Israel and at least 11 European countries already allow access to cannabis for medical use.
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