Since nicotine is a form of a stimulant drug, in cigarette smoke it can cause addiction.
Many people who smoke are actually addicted to smoking, and cannot stop doing so easily, which is similar to how drug addicts behave when it comes to using drugs. 
        
             
        
        
        
Answer: can u zoom in pls then i can maybe help..
Explanation:
 
        
             
        
        
        
I think its reproductive cells like egg or sperm