The quicker you can get them to stop smoking, the better
If your home smells heavily of smoke, you will want to consider performing a deep clean of all surfaces, which includes washing walls and ceilings
Use gradually becomes automatic reaching for tobacco without much awareness, tied to specific moments such as after meals, with coffee, or while driving
References Centers for Disease Control and Prevention: Health Effects of Cigarette Smoking World Journal of Gastroenterology: Prevalence and Risk Factors of Asymptomatic Peptic Ulcer Disease in Taiwan World Journal of Gastroenterology: Epidemiology of Perforated Peptic Ulcer: Age- and Gender-Adjusted Analysis of Incidence and Mortality World Journal of Gastroenterology: Asymmetric Dimethylarginine: A Novel Marker of Gastric Mucosal Injury
Tobacco is the biggest killer causing death of around 160,189 people in Pakistan every year
Now, just to give you a couple of examples of what the tobacco companies did when they acquired familiar brands in the ultra-processed food market