When was the building constructed or majorly renovated? That will tell your which version of the fire code is applicable.
The lack of insulation in the wall would indicate to me that you don't have an STC rating (sound transmission) which meets code either.
You have different legal options open to you if you bought the condo 'new' from a developer and the construction does not meet code, or if you bought it as a 'resale' and the building is still within the warranty period. You may want to consult with the city building inspections department and a lawyer experienced in construction law.
You may also write a letter to the condo/strata board about this issue, though I think this »www.vancouversun.com/health/Smok ··· ory.html
may be a better option to sneak into the building by-laws if the construction is that crappy and it's too expensive to remedy the construction (ie. if you owners have to foot the bill).