Can you smoke 9 year old Montecristo Cigars

I have a 9 year old Montecristo no. 1 Cigars that are unopened and still in the plastic and I am wondering if they can be smoked. They have been kept in normal apartment conditions, no humidor at any point. Therefore they have been exposed to heat and cold, but nothing too extreme. Also, how can I tell if they are still good to smoke? Thanks!