In cities with indoor smoking bans, hookah bars have been forced to close or switch to tobacco-free muassel.
The distribution stops were focused on bars, cafs, hookah lounges, thrift and antique clothing stores, college restaurants, liquor stores and college housing.
Levels in exclusive hookah smokers were lower compared to cigarette smokers although the difference was not statistically significant between a hookah smoker and a non-smoker.