mouth sores from smoking cigarettes Tobacco and Oral Cancer: Expert reveals early signs and ways to prevent this deadly disease Smoking & Oral Health: Chestnut

Although mechanisms remain uncertain, smoking-related inflammation, oxidative stress, and DNA damage are thought to worsen outcomes [152]

In the clip, the flight attendant told Nguyen he was doing something dangerous and demanded he stop smoking because she was worried about the passengers

Specialty tobacco shops carry more niche brands, have more variants in stock, but price is usually even higher

and some research suggests that this is down to the puckering of the mouth when drawing a cigarette as well as the squinting in response to the smoke

For those of you who are unfamiliar with the original article on the Tattoo you can see it here