too much tobacco Can Smoke From Your Cigar Be a Bad Thing? Too Much Weekend - Wikipedia
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Addiction 104 , 669675 (2009)

Over the past few decades, smoking tobacco has gone from being seen as a benign pastime to a life-threatening and addictive habit that harms not just the consumer but those around them

Pharmaceuticals 2019, 12 (2), 49

In other research, exposure to secondhand smoke has been associated with impaired lung function in children, which is related to chronic obstructive pulmonary disease (COPD) in adulthood (Johannessen, Bakke, Hardie, & Eagan, 2012)
Despite a continued decline in global cigarette volumes, strong pricing, improving NGP margins, and disciplined capital allocation drove earnings higher and strengthened Imperials position among Europes top dividend payers

So, when should you see a doctor about them
