Is marijuana smoke worse for your house than tobacco smoke?
I think you need to deal with weed the same as you would tobacco.  The smell is just as bad as tobacco.  It FOR SURE permeates drywall.  I have had to rip out drywall from a few pot houses.  I think some things you need to think about are:


that most tobacco smokers try to air out their house.  They may smoke more in volume but generally they smoke out windows or open windows/doors after smoking.
weed smokers may let the smoke sit in the room or create a hot room.  It wouldn't take a great deal of time before a house was smell infested.
also weed smokers may grow their own.  The marijuana plant stinks and can stink up a house in a few batches of 5 plants.


Really there is a great range of possibilities with both set of smokers.  I have rentals and I personally would be more worried about weed.  I think it is because the amount of smell damage you can do to a house with weed in short amount of time.  I have had rentals before that I had smoke cost fears and talked to the renters way before it became permanent.  I would feel I would need to check in to a house smoking weed every few weeks.  It is just more of a communal drug and people often prefer holding the smoke inside.