Hiding the smell of weed.

Go to a tobacco shop and they should have air freshener / spray that gets rid of smoke. I use this one that has a enzyme that works really well.

i filled a poland spring bottle with dryer sheets and poked some holes in the bottom for the smoke to leave. it works great. better than a cardboard tube imo

Hmm, I wouldn't risk it, but that's me, you are you.

Light a candle.

Tell them you are going to take the dog for a walk?

Walk the dog and smoke...

Exercise, bonding with mans best friend, and blazing it up...

Sounds like a good idea to me imo...