impact of cigarette smoking on the family through generations in families – 2baconil Parent Smoking: Over 1,221 Royalty-Free

A 40-year-old American man in 2014 could expect to live nearly eight years longer than his 1964 counterpart, and roughly a third of that improvement comes from tobacco control alone

D., Prokopczyk, B

Otherwise, there is some degree of inference, since individuals usually have some variability across their cognitive abilities and skills pre-injury, and some changes may have happened in the intervening decades as a result of normal aging and the drug and alcohol use (although, with years of being clean and sober, some of the latter may have been mitigated)

Maxwell JC

For that to have decreased to 9.9% signals enormous progress