I'm type 1 with neuropathy and vape cbd oil(which is legal) thc is the illegal bit... I've been vaping for a month and already my legs and feet are no longer pins and needles, shocks every time I walk... none of it is there any more... I've noticed my HbA1c has significantly dropped from 90 to 70 in less than a month too... I'm 26 now and have had type 1 since I was a 3 year old, went through the rebellious stages in life and now paying the price! But now under better control
this is something your friend needs to research a lot first because he/she will have a significant drop in blood sugar levels whilst using cannabis oils... the best ratio for diabetes and/or complications is 1:1 that would be CBD and THC (one part each) I only use the CBD because it doesn't give effect of the "stoned" feeling, just stops the pain! Hope this is of some use to you