In contrast, nicotine replacement therapies (e.g., patch, gum, lozenge) and some prescription medications (i.e., varenicline, bupropion) have been evaluated by the FDA and found to be safe and effective at helping people quit smoking
Together, these findings indicate that smoking even a small number of cigarettes per day has substantial negative health effects and provide further evidence that smoking cessation benefits all smokers, regardless of how few cigarettes they smoke. Even people who said they smoked an average of less than one cigarette a day had a 64 percent higher risk of dying early than nonsmokers, the researchers found
There are other social complications, like the fact that shoveling any sort of powder into your nose while in public is quite suspicious for obvious reasons
Methods: Smoking status was based on smoking pack-years and cigarettes per day, and alcohol consumption was measured in units/day