While smokers are the primary addictive personality it remains okay to demonize, obesity is not far behind. 

And if smokers tried to quit before and gained weight, they are less likely to try again, according to scholars at Penn State College of Medicine. 

Weight gain is a predictable occurrence for smokers who have recently quit. Within the first year after quitting, people  gain from eight to 14 pounds on average. Some smokers report that they keep smoking simply because they do not want to gain weight from quitting. 

This is more attractive than being fat.
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Susan Veldheer, project manager in the Department of Public Health Sciences, predicted that smokers would avoid treatment to quit if they are highly concerned about gaining weight so they surveyed 186 smokers who sought treatment to quit and 102 smokers who avoided treatment.

Smokers were defined as "seeking treatment" if they participated in a smoking cessation treatment research study. Other smokers were approached in the clinics and offered the cessation treatment research study. If they were not interested in the study, they were defined as "not seeking treatment," or avoiding it. Participants were current smokers who smoked at least five cigarettes per day and were recruited from Penn State Hershey Medical Center.

All participants were asked about weight gain during past attempts to quit and their concern for gaining weight after quitting in the future. Overall, smokers who sought treatment to quit were equally concerned about gaining weight as the smokers who avoided treatment. The difference was in whether or not the smokers had gained weight before. Of all the participants, 53 percent had gained weight during a previous attempt to quit smoking. Within this subgroup, smokers who were highly concerned about gaining weight were more likely to avoid treatment to help them quit. These findings appeared in The International Journal of Clinical Practice.

"Perhaps we shouldn't be surprised that smokers who gained weight previously are 'once bitten, twice shy,'" Veldheer said. "They are concerned about weight gain if they attempt to quit even though they may know the benefits of quitting."

Researchers suggest that clinicians should ask smokers if they had previously gained weight while trying to quit. If so, these smokers should be assured that strategies to maintain weight will be addressed in treatment.