According to the CDC, 80-90% of lung cancer deaths are linked to cigarette smoking (1). It seems like a simple solution for people to just not smoke...
(1) https://www.cdc.gov/cancer/lung/basic_info/risk_factors.htm#....
(1) https://www.cdc.gov/cancer/lung/basic_info/risk_factors.htm#....
'When the person stops using tobacco, nicotine levels in the brain drop. This change triggers processes that contribute to the cycle of cravings and urges that maintains addiction. Long-term changes in the brain caused by continued nicotine exposure result in nicotine dependence, and attempts to stop cause withdrawal symptoms that are relieved with renewed tobacco use.'
https://www.camh.ca/en/health-info/mental-illness-and-addict...