smoking cigarettes can harm smokers by What chemicals are in a cigarette? | What does do to your body? Smoker's Conditions: The Harmful Effects
Description
Participants were randomly assigned to the active or the sham treatment group

Avoid brands that claim "lab tested" without publishing the actual results, lab name, or detection limits

Most people trying to quit find that the urge to smoke passes after a few minutes
Because it always clouded the clues

A.MorrisonM.HugenholtzP.et al (2016)

By understanding what drives your habit, you can begin to gain control of your actions
