*If* a neighbor were to call the cops.....

[scrumby]

if by some chance the police DID arrive, smell pot (that's all the 'probable cause' they need to enter your home)

If you are talking about the U.S. you are totally wrong. To begin with "probable cause" has no bearing whatsoever upon the entering of a dwelling. As a cop you either have a warrant, or you are given egress. There is no such thing as "probable cause" even in the grand request for a warrant from a judge. Either you have witness to a crime, or you don't.