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Unfortunately, there is not a whole lot you can do against the tenant. You would need to go after your landlord directly for breaching the lease agreement with you. The landlord can likely address the issue from wherever the smoke is coming in by better sealing the shared wall you have with your neighbor.
You would need to argue that the apartment is uninhabitable due to the marijuana smoke coming in to your apartment for you to claim a constructive eviction. This may be a little bit of a stretch.
Your best (and easiest bet) may be to ask the landlord if he will allow you to terminate the lease early due to the issue you are having (by executing a mutual release of the lease instead of treating it as a breach of the lease and there being consequences for you) and try to find a new place to move to.
The landlord should be responsible for putting sealant around the wall of the apartment (on your side) to try to prevent the smoke from coming in.
It is not normal from smoke from the neighboring apartment to creep into yours. The landlord is responsible for identifying where the smoke is coming in from and attempting to address the issue.