Hi an allergist could be asked, and the company that prepares it could be asked.
There seem to be only 3 things in common. One is they are both plants and therefore belong to the plant family and the other is that they are both evergreen. They both have resin but it seems it is a different type of resin. Everything else seems different, a different order, family, and genus. If a person wants to try something it could be watered and tried on skin to see if it irritates it if it does I would not bother putting it inside. Then 20 minutes later a whiff first far away and then close if it doesn't make a person cough. After 20 minutes a person might try a small lick if nothing happens then more. After 20 minutes it may be safe to try a pea size amount and slowly increase the amount after 20 minutes. If any symptoms are experienced in the process of this I would not bother with it again or any more.
Cabbage and cabbage juice is said to be good for gastritis and also how the stomach is taken care of makes a big difference. I would definately avoid things such as hot spices and meRAB such as ibuprofen which seem to cause an awful lot of people a terrible stomachache and maybe worse such as a perforation. Hope this helps. :wave: