I don't know if there is a conclusive study that says cigarette smoking stunts growth. But judging from the list of harmful substances in cigarettes, it is completely reasonable to answer "yes" to your question.
Cigarettes are well known to reduce lung capacity, increase the chances of cancer, increase risks of cardiovascular problems, and are addictive. While these problems may or may not directly impact HGH release, they will certainly impact how your body responds to the growth hormones.
For example, your body needs plenty of oxygen to metabolize efficiently. Reduced lung functions due to smoking will certainly have a negative impact on your metabolism, and hence your growth. According to an article from Harvard University:
As few as five cigarettes a day produces signs of airway obstruction and slowed growth in lung function. The more cigarettes smoked, the greater the loss of lung capacity, the researchers found in a study of more than 10,000 young people in six cities.
For unknown reasons, the impact is greater on girls than boys. "Nonsmoking girls reach and maintain a higher maximum level of lung function than smokers," says Diane Gold, assistant professor of medicine. Teenage smokers appear to begin a decline at a time --17 to 18 years old -- when nonsmokers reach a peak of lung development. "The higher their lung function, the better respiratory health people enjoy both as adolescents and adults," Gold adds.
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So in the end, cigarettes can stunt your growth indirectly through by damaging your bodily functions in various ways. Another thing I want to add is that cigarettes are carcinogenic. If I was a smoker, I'd worry about cancer first.
