8.21.1: The tenant is not allowed to smoke or permit any guest or visitor to smoke tobacco or any other substance in the premises, unless they have obtained the landlord’s prior written consent. Such consent will not be unreasonably withheld.

Intention of the Clause:
The clause aims to clarify the rules around smoking within the rental property. It sets forth the conditions under which smoking is allowed or prohibited, and what the tenant needs to do if they wish to smoke.

Why It's Important:
Understanding this clause is crucial for both landlords and tenants for several reasons:

1. Health and Safety: Smoking indoors can pose health risks to the occupants and can also increase the risk of fire.

2. Property Maintenance: Smoking can cause staining, lingering odours, and even damage to the property, which could result in deductions from the security deposit.

3. Insurance: Some insurance policies for rental properties may be voided if smoking is allowed without proper consent.

4. Legal Compliance: Adhering to this clause ensures that both parties are in compliance with the terms of the tenancy agreement, avoiding potential legal disputes.

5. Neighbour Relations: Smoke can travel and affect neighbouring properties, so adhering to this clause can also be seen as a sign of respect for the community.

By fully understanding the implications and requirements of this clause, tenants can make informed decisions and landlords can maintain the integrity and value of their property.