No bears cannot smell the food through the food cans.
As long as the food cans remain sealed and have not been opened then the bear is unable to smell the food in those food cans.
However while bears do not have the ability to smell food through the sealed food cans the bears have come to know that those food cans contain food.
So while the bear cannot smell the food in the food cans the bear may still try to get to the food in the food cans or take off with your canned food.
So make sure to store any canned food out of sight of a bear or bears such as in your trunk of your car or in a toolbox or hidden somewhere in your vehicle.