Somewhat off-topic for here, but possibly of interest. Already posted in PAS.
Adam Winstock, the consultant psychiatrist and addiction medicine specialist who founded the survey, said: “Four percent of people were reporting persistent numbness and tingling in their fingers and toes.”
Regular, frequent users, are at risk of peripheral neuropathy, although it is reversible.
He added: “It’s not that this drug is dangerous but if you are taking it at that sort of level, it will deplete your levels of vitamin B12.”