According to the reference guide, there are:

CASE 1 OPTION 1, where smoking is prohibited,
CASE 1 OPTION 2 (Non-residential projects), where smoking is prohibited except in designated areas, AND
CASE 2 (Residential and Hospitality Projects), where smoking shall be prohibited in all common areas and within 25ft of entries, and some requirements are set for private units, such as weather-strip exterior windows and doors, sealing of vertical chases, and ANSI/ASTM-E779-03 compliance.

We have noticed that CASE 1 OPTION 2 allows areas for smoking since these are designed accordingly (isolation smoking rooms), BUT IT IS NOT CLEAR WHETHER THE SMOKING ROOM IS REQUIRED FOR CASE 2.

Hence, for a multi-unit residential building (CASE 2):
1. Shall each apartment be treated as an isolation smoking room and have their ante rooms at entries? (As long as smoking is prohibited at balconies, CASE 2 requirements are met, and each apartment HVAC system is designed so there is no recirculation of ETS to other dwelling units)
2. Are isolation smoking rooms required for each apartment?
3. In case isolation smoking rooms are not required, must be there a very specific area within the dwelling unit where smoking is allowed? (in other words, in order to respect the 25ft minimum distance from entries, shall smoking be prohibited in every small room that is exposed to the outdoors? The concern would be to protect the entries of adjacent apartments).