e cigarettes authorized by the fda A Closer Look at 34 FDA authorizes first e-cigarette, cites

They also provide the ability for users to dial down the nicotine content to suit their tastes (read: needs )

Built-In Squeaker

The term chain smoker often also refers to a person who smokes relatively constantly, though not necessarily chaining each cigarette

There is some evidence that the deposition of the particles produced by cigarette smoking is different to that due to biomass or occupational exposures as these are mostly inhaled nasally where the filtration efficiency is higher, whereas tobacco smoke is inhaled through the mouth at a high flow rate leading to greater deposition in the lower airways and alveoli [22]

These resources can help employees who want to quit smoking