tobacco smoke contains carcinogens carcinogens, their biomarkers and tobacco-induced cancer Smokeless tobacco and cigarette smoking:

They found that pregnant women who lived in an area with high retailer density were 67% more likely to be smokers than pregnant women living in an area with low retailer density, even when controlling for income, year of delivery, mothers age, urbanicity, and neighborhood maternal smoking prevalence

Now this has made them a lot easier to find

To summarise: WTS is associated with the delivery of physiologically active doses of the dependence producing drug nicotine, some waterpipe tobacco smokers engage in nicotine self-administration via waterpipe on a daily basis (sometimes multiple times/day32), and the literature documents that waterpipe tobacco smokers experience withdrawal, alter their behaviour in order to access a waterpipe and have difficulty quitting, even when motivated to do so

Before that decision, Rees had said the FDA needs to also consider whether the product is being marketed in ways that attract attention of some young people who don't already smoke