As the Bay Area Reporter reported last week, the board had voted to approve a ban on smoking that exempted cannabis. As per board procedure, the ordinance would face a usually perfunctory second vote and then be sent to the mayor's office for her signature.But when the time came for that second vote, District 3 Supervisor Aaron Peskin had a change of mind after having heard from people in his district who were concerned about the negative implications of a smoking ban for long-term tenants (many of whom signed leases before not allowing tobacco use was standard in rental agreements), a City Hall source told the B.A.R.During last week's meeting, tenants rights advocate and District 5 Supervisor Dean Preston had raised some of those concerns,.