Cannabis use is for relief and is not a causal factor
for neuropathic problems like PN.
But poisons are a causal factor..... like pesticides, growth chemicals, soil treatments, etc.

That, could be causal.
Finding which one, will probably be like
the proverbial 'needle in the haystack'.

The treatment for poison or chemical causes for PN are
all the same, practically (unless it is an exotic that can be identified & is treated differently).

Concentrate on learning as much info
(the 'stickies' at the top if the 'Topics' page)
as you can, and find out about treatments for PN
that fit your symptoms.