From what I understand, it is illegal as per the USDA to bring back pimento wood into the US. It could be environmentally hazardous if something was in the wood like bugs you may not even see. Its no different than bringing meat or fruit. Not sure about the treated mentioned.
For use in a smoker I 'd recommend applewood chips which are easy to find in the US and throw some pimento berrys on the wood for flavor.
There are websites that sell pimento online. I 'd suggest obtaining it that way.
never had a problem bringing into canada in storage bags, do not worry, it is not like bringing back gangi, soon come
I buy it online. It's a bit pricey but worth it.
my window faces the south
I have a few sticks left out in the garage right now, think split oak about 12 inches long. I have almost given up on the chipping and soaking technique I use with apple, mesquite, etc. The wood is very hard and I just split it down into smaller pieces and lay it direct on the coals in my smoker. I have won a few cook offs with it. Funny thing, swear to god, it doesn't work well with beef, is OK with pork, but kicks it with chicken.
I have won many awards in a lifetime of competition and service. But the highest was offered without plaque or fanfare on a hilltop in post Ivan Jamaica. A true Rasta and a dear friend observed "Chet you are like a father of men, you see need and fulfill that need without being asked". Let us be travelers and not tourist.