The inspector, who was very confrontational a moment earlier, smiled at me, apologized for inconveniencing me, quickly packed up and left.

I went myself to verify and make sure that nothing had changed in their policies.In another town, we had a furnace replace, while the company was there and we were not there the code enforcement officer unannounced and uninvited and without permission went into the house and confronted the firnace isntallation company. 

If they weren't, I would confront the company ASAP.

Do not confront your tenants directly!

I have had exactly that scenario, confronted the person and it was her parent's dog which she takes hiking regularly.

If she confronts you or your tenants, make sure you record the interaction.

(Actually going to pull the new carpet back along the shared wall and spray foam any gaps under baseboard).I have not confronted the neighbors yet as it is in my experience that smokers in general (especially dedicated ones as they clearly are) do not particularly care and it is unlikely that they would stop anyway.

I'd avoid confronting them about it now.

Thanks....How would you go abut it without direct confrontation? 

I understand there might be hesitation with an immediate increase because this would force out the current tenant or might lead to confrontation, but it's your business to manage.