Griffith did nothing wong <| sep |> You can sue for the cost of remediation to clean a unit and will likely win if you have any reasonable proof that the damagecontamination occurred after renting However only if the cost is significant and if the cost of remediation goes above and beyond the usual ' wear and tear ' cleaning and repair costs . In Ontario , generally speaking you cannot bar someone from engaging in activity in a rental that they could do in a wholly owned property unless it ' s affecting other tenants in the same building . There ' s nothing stopping you from suing to recover costs . Yes you can but you know what ? 1 . who the fuck have time to go to court to sue for this ? 2 . And people you sue would have nothing . Sure you can garnish their wages its going to take you years to recoup the cost . 3 . No smoking clause can probably counter the medical marijuana . You can eat it that is one form of talking it .