Re: Need an answer
I'm allergic to coconuts, sounds like it's not nearly as bad as your buddy, but still. I use coconara's with no ill effects.
Most food allergens can be destroyed by cooking... It's possible that the allergens could be destroyed when the shells are turned into charcoal, which is mostly carbon... I mean, you are talking about a serious breakdown of component chemical structures here.
I think it would be okay... But I would try to ease him into it for saftey's sake. See if he can safely handle them, and if that's cool, see if he can be around it burning with no ill effect before smoking them.