It's not a scam. I don't believe it will save the world but given a chance it might make a lot of people better, what have we got to lose? There's thousands of peolpe dying every year anyway.
I have googled Dr Guzzman and his study; mice that had glioma,a fast acting cancer with no current effective treatment, were injected with THC,the cancer dissapeared. No one disputes this,not even the big pharmaceuticals!
THC Kills Glioma Cancer Cells – Cannabinoid Research from Europe Cannabis TV Vlog