An on/off switch defeats the purpose of a smoke alarm. You turn it off when you cook, forget to turn it back on - no alarm. You turn it off when the perfume spraying starts, forget to turn it back on - no alarm. You turn if off when the air spray spraying starts, forget to turn it back on - no alarm. Yet all three times, you think you're safe because you haven't heard the alarm trigger.
If reasonable use with simple sprays are setting off the alarm, then it's possible the alarm is defective.
If the spray usage is really extreme, then you might need to suggest that in order to minimize the false alarms, wife will have to give up cooking or the sprays. Be prepared to increase your dining out budget.