Is there a safer way to use THC for chronic neuropathic pain than smoking it?

A drug that contains both THC (delta-9-tetrahydrocannabinol) and cannabidiol, CBD, is being studied. It is in a spray form for use in the mouth, either under the tongue, or inside the cheek. One trial, with a relatively small number of subjects showed that it was effective in treating neuropathic pain, sleep, allodynia, and disability.

Reference: 

T.J. Nurmikko,et. al. Sativex successfully treats neuropathic pain characterised by allodynia: A randomised, double-blind, placebo-controlled clinical trail.PAIN December 2007. Volume 133. Issue 1-3. Pp. 210-220.

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