Sounds like the two were having a conversation about medical benefits. I think his response was reasonable within the given context. Nothing wrong with feeling better about yourself so long as you are not doing so at the cost of potentially harming yourself or others. Spreading potentially false medical facts is risky because not everyone will do their own research.
We have no way to know if the response was reasonable or not, because we were not privy to the conversation and we were not given a list of the claimed health benefits, so we can't judge for ourselves of do our own research.
This was an anecdote that looks reasonable to the casual reader, but amounts to emotional propaganda if you pay close attention.
The reality is that there are many credible medical uses of cannabis, for example in helping people avoid much more dangerous drugs that are legal, frequently prescribed by doctors and frequently lethal, such as certain opiates. I would like to know if ginger also helps with that.
As with all substances, there are counter-indications to using cannabis. However, massive empirical data shows that it is overall safer than abusing many other legal substances, for example refined sugar. It receives an undue amount of scrutiny, which is not scientific but of a political nature. And make no mistake, the prohibition started for very concrete political reasons that had nothing to do with public health preoccupations. If the US government was truly concerned with public health, it would provide nationalized healthcare in the same fashion Europe does. And again, there is a massive amount of empirical data supporting this assertion. Let's separate politics and religion from science.
