No-Smoking Clause In Lease Renewal Not Enforceable

http://www.cbc.ca/canada/montreal/story/2007/07/10/qc-nosmokingapartment0710.html

A woman who wants to smoke in her Montreal apartment despite her landlords' objections has won her fight to light up.

...
The rental board said an application form is not a binding document and tenants can't be held to its specifications.

An interesting article.

Just to clarify, there was no clause about non-smoking in their lease renewal.

The distinction is between rental application form and the lease itself.
If they put a clause in the lease (even if renewal lease), then the clause can enforce.

"But the door is still open for landlords who want to ban smoking by including a clause in their rental lease. No one has challenged a no-smoking lease clause at the Quebec Rental Board."