Most people dont sit and think about sleep in this way, but your preparation for sleep is probably highly structured. You might always sleep on the same side of the bed, for instance, or turn on a bedside lamp instead of an overhead light to signal to your brain that its time for bed
Diacetyl is found in tobacco cigarettes as well
Glasser AM, Vojjala M, Cantrell J, Levy DT, Giovenco DP, Abrams D, Niaura R (2021) Patterns of e-cigarette use and subsequent cigarette smoking cessation over 2 years (2013/2014-2015/2016) in the population assessment of tobacco and health study
Giving up is associated with reduced depression, anxiety and stress, while boosting overall quality of life
Will I get addicted to nicotine from smoking pipe tobacco in cigarettes