I’m not from Portugal but you might have luck if you look into other nearby countries. The UK no longer being in the EU may complicate it. The orders I get ship from the Isle of Man.

Do you know if your government has fairly high taxes on tobacco?  If customs find tobacco in a package (arriving in Canada) they let it through but put a hefty duty on it, which is done for all tobacco products to “discourage” you from using them (and make money for the govt)

if taxes aren’t high (and Canada has some of the highest) they may have less incentive to intercept and put duty on your snuff.  I’d imagine it would be similar to Spain and other EU countries, but everywhere is different. Good luck!