Tenant doesnt' abide by the lease agreement

[Ali BenAyed]

I've been wanting to break the lease with this tenant. The next door neighbor called me to let me know that there are different people that live in the house I'm renting out, every 6 months, there are 2 dogs and he can smell smoking when the lease agreemnet has one person on it, allows for 1 dog only and prohibits smoking. I called couple lawyers, and they said Montgomery County doesn't allow eviction based on beach of contract, evictions are only possible when the tenant doesn't pay. Any suggestions how handle this situation? 

[Jonathan Taylor Smith]

Hmmm @Ali BenAyed - I know some states/counties have laws that are certainly NOT in favor of the landlord; however, here I'm to believe that in Montgomery County MD that a tenant can do ANYTHING THEY WANT in and to your rental property (regardless of lease violation) with NO FEAR of eviction - as long as they pay the rent!? That just sounds like it can't possibly be true, because if it is, why would the lease need to state anything more than the rent amount if nothing else matters? But if it is true, then I would only write month-to-month leases.