"Ozone can be used to sanitize " ... yes it can.. in fact one sewage treatment plant in New York state was using it very efficiently by the 1970's ... however, it involved pumping and spraying the effluent through a closed chamber to expose it to the ozone..
The problem you are dealing with does not involve ' sanitizing'. because no living animals are causing the smell.. unlike say... a 'moldy' smell...
You have particles which continue to " outgas" enough molecules which contain the smoke smell to be offensive....so you need to get to those particles and either change what they smell like, or encapsulate them so they can not continue to 'outgas'...
So you need to physically remove them from the car.. and a big problem is getting them airborne inorder to deal with them.. this is why I suggested first physical measures, then passive odor adsorbing chemicals which would be used in the long term while you are not in the car...
The charcoal is actually used when some poisons are ingested... much like burning toast to eat...