I'm in vermont where it is legal to smoke weed.

Within a couple of days, our neighbor said that they smelled weed from the backyard.

As a neighbor, personally I don't care if someone smoke a little weed every now and then, but if they are smoking non stop 25 times a day, you might lose a good tenant over that. 

Security Deposit: 2600Lease states no smoking/painting walls/no hanging things on wallsTenants have moved out and have left two truck loads of garbage to be removed.Damaged doorPainted walls which got on the ceiling and trim Lots of holes on the walls throughout the houseDamage from windows being left open constantly Weed was clearly smoked in the house (smell throughout the place) so we need to deep cleanWater bill wasn't paid so I had to turn back on utilityMissing keyQuoted costs:$450 junk removal (some furniture)$935 for damaged doors/windows, painting cleaning$30 for utility turn onTenants were only there for a year before moving out so a lot of this is beyond normal wear and tear. 

I've cut 99% of unwanted calls doing this routine.

If someone isn’t willing to provide ID, they are not a serious applicant and possibly a scammer, so it’s a good screening tool to weed out the tire-kickers and sketch balls.

Check "flexible" dates for a house with a pool to weed out the condos with shared pools.

The tenants are not pulling/spraying weeds around their building, so it takes me about 30 minutes every month to pull weeds and spray.

It is growing like a weed and there plenty of growth left to be had. 

I find this screens out any guests that could have issues and lays the groundwork for a great stay.It also weeds out folks (in our case) that aren't understanding the distance to town and certain activities in our area.