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Can people be enforced not to smoke in property ?
Is it allowed to check on whether people are actually smoking in the property by for example arranging a control visit in the property or perhaps meet in person before letting the person in the property ?
There is only so much you can do and is feasible and practical.
At end of the day it's your property , your rules.
Deposit with posters saying you will lose deposit if you break rules, such as smoking
Be creative