I will say that the cauldron of different perfumes and after shave that usually exists in an office environment is equally disgusting as those stinky smokers.
Saying that smokers are in a “low class” and intellectually deficient is certainly an overstatement.
How else would you interpret the data at: http://www.gallup.com/poll/105550/among-americans-smoking-decreases-income-increases.aspx
Every study of smoking rate vs. income shows that smokers have lower incomes than non-smokers. Certainly some high income individuals smoke, but they risk making a first impression that places them in the lower classes of society.
Smokers tend to have lower IQ than non-smokers. Again, an individual may smoke and be intelligent, but the statistics are against it. The individual who smokes puts himself in a group which is less intelligent than average.
You make a very valid point about all of the scents that surround employees, especially the mixture of perfumes and colognes that can send people into sneezing and coughing fits. My office mates have always been so obliging when I explain that those scents make me ill. Another yuck for me, while not as common: coffee. I sat between two people with strong coffee blends yesterday... Yuck.