Who are Susceptible to smoking ?
The same research was also conducted on many siblings. In the research it was seen that the sibling who smoked had lower IQ levels than the non smoking sibling. The study done by Dr Weiser eventually says that the people with lower IQ levels are more susceptible to smoking than the ones with higher IQ levels and not vice versa.
Hence, non smokers are definitely smarter than smokers as they choose to go the healthy way. Cigarette hampers the fitness level and you are more prone to fatal diseases when you smoke. So, it is better not to smoke and choose the smarter way to keep overall health in order.