Kathy, suppose it really depends on the suit-case material.
Do you have somewhere like a balcony, porch or garden where you can leave them opened up in the fresh air. Before the smoking ban came into affect in Scotland if we had been out in a densely smoky place I use to hang Ron’s suit on a clothes horse on the porch. I used to hang my clothes in the shower room and run the hot water so that the steam not only took out the creases (I hate ironing), but then I aired them too on the clothes dryer. I do this when we go on holiday, I take a few clothes hangers in my case and on arrival in our room hang my dresses on the hangers and steam them in the bathroom. You don’t have to use a lot of water, if you are in a shortage area - put some hot water in the bath and close the door for 15 minutes. What some people will do to avoid ironing.
The other alternative is to sprinkle some of your favourite essential oil on a cotton wool ball and place inside the case.
As a holier than thou ex-smoker the very thought of the sour smell of cigarettes reek makes me nauseous. I always said I would never become sanctimonious regarding smoking, but I just can't help it.