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Urea the main component in urine is added to cigarettes to enhance the flavour. Yuck

Studies have also shown that people who smoke have higher levels of cortisol (a hormone released during times of stress) than nonsmokers do suggesting that chronic exposure to nicotine may affect hormones related to stress levels and create a more anxious state overall

doi: 10.1111/j.1471-4159.1987.tb00973.x

At the banquets of Aztec nobles, the meal would commence by passing out fragrant flowers and smoking tubes for the dinner guests

Silicone hardness, measured in Shore A durometer, directly impacts the case's feel and protective qualities

Smoke residue often contains carcinogenic compounds, which can be particularly harmful to those spending extended time in contaminated spaces