日本からカナダへタバコを持ち込む場合、２カートン以上だと税金がかかりますよね。

この場合、持ち込む量が増えるにつれて税金も上がるということでしょうか。だとしたら、１カートン増えるにつき税金はどれくらいかかるんでしょうか。

どなたか知っている方教えてください。

参考に。
http://www.cbsa-asfc.gc.ca/publications/pub/bsf5056-eng.html#P025 　

Tobacco products

You are allowed to bring in all of the following amounts of tobacco into Canada without paying duty:

* 200 cigarettes;
* 50 cigars or cigarillos;
* 200 grams (7 ounces) of manufactured tobacco; and
* 200 tobacco sticks.

If you include cigarettes, tobacco sticks or manufactured tobacco in your personal allowance, a partial exemption may apply. You will have to pay a special duty on these products unless they are marked "CANADA - DUTY PAID ? DROIT ACQUITTÉ." You will find Canadian-made products sold at a duty-free shop marked this way. You can speed up your clearance by having your tobacco products available for inspection when you arrive.

If you bring in more than your personal allowance, you will have to pay regular assessments on the excess amount. These regular assessments can include duties, taxes and provincial or territorial fees. Border services officers will give an allowance for products that are marked "CANADA - DUTY PAID ? DROIT ACQUITTÉ" when they calculate the amounts owing. 　

免税を超えた場合のタックスレートは、確か1カートンにつき15ドル＋GSTだったと思います。