is fake cigarettes safe How really are E-Cigs? Fake Cigarettes to Quit Smoking:

This flexibility contributes to a healthier transition for smokers aiming to quit

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Our results indicate that excessive use of cigarettes, or chronic exposure to their compounds, affects visual discrimination, supporting the existence of overall deficits in visual processing with tobacco addiction. Although the research did not give a physiological explanation for the results, Silverstein said that since nicotine and smoking harm the vascular system, the study suggests they also damage blood vessels and neurons in the retina

Carbondale and Edwardsville, Ill.: Southern Illinois University Press

In other words, the nerve fiber is a logical machine in which a later decision is made on the basis of the outcome of a number of earlier decisions