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http://www.cbsa-asfc.gc.ca/E/pub/cp/...tml#P181_22269

After each absence of seven days or more
You can claim up to CAN$750 worth of goods without paying any duties. With the exception of tobacco products and alcoholic beverages, you do not need to have the goods with you when you arrive. Although you can include some tobacco products and alcoholic beverages, only a partial exemption will apply to cigarettes, tobacco sticks, and manufactured tobacco. You may have to pay a special duty on these products.