Well, yes, smoking can lead to blindness. According to some researches, smokers are twice as likely as non-smokers to one day lose their sight. First, you should know that smoking is a proven cause of Age-Related Macular Degeneration (ARMD), which is the leading cause of vision loss. So it can be very dangerous to smoke. Also, you should know that if you keep smoking, it will not only do a lot of harm to your eyes. For long term effects, it can lead to lazy eyes, and hearing loss. And also, smokers may develop toxic amblyopic problem. it can degrade the night vision. So it can be kind of dangerous. Anyway, just quit smoking. Or it can be dangerous for you.