Is it legal to use lead jigs in quebec
The short answer is Yes.
An official answer according to the Quebec Fishing regulations is quoted below.
Line fishing and Fly fishing:
For these types of fishing, your line may be equipped with artificial lures, hooks or flies, and may be baited or unbaited. A hook may be single or multiple. An artificial lure or a fly counts as a hook.
Artificial lure:
a spoon, minnow lure, artificial fly or any other device made up of feathers, fibres, rubber, wood, metal, plastic or other similar materials and equipped with one or more fish hooks.
I did find a reference to lead being prohibited in National parks and wildlife area.