Interesting numbers are being reported from the US in a survey of 473 adult therapeutic cannabis users. 

87% of respondents are reported as giving up prescription medications, alcohol or other drugs in favour of cannabis. 

The US is known for having a problem with opioid painkiller and herion, both have driven overdose deaths to the point where they are now the leading cause of fatal injuries.

So, which is the lesser of two evils? Cannabis, a plant which has never cause an overdose or opioids causing levels of destruction never before seen in the US?