Converting to non-smoking buildings in a rent-controlled jurisdiction

We have a rent-controlled jurisdiction in San Francisco, which has presented a challenge for going smoke-free and has also created a bit of a divide for the tenant-rights community (worry that landlords will use this as a basis to evict in a hot housing market and to get rid of their rent-controlled tenants). If landlords were to insert a new provision in the leases about smoke-free units, that would be considered a reduction in services without an attendant decrease in rent-- which is not allowed. It seems like going smoke-free is something that will have to be slowly phased in, especially slow here because of the rent control ordinance. Are there any other jurisdictions that have gone smoke-free that also have rent-control so that we can look to them as possible examples? Any ideas about getting around this hurdle?