Then they will look into genetics and environmental factors
Some participants may be aware of the harms of tobacco smoking combined with spliff use and thus seek to reduce engagement in another harmful behaviour
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Jha et al., 2013 found that adults who quit smoking at ages 25-34, 35-44, or 45-54 gained about 10, 9, and 6 years of life, respectively, compared to those who continued to smoke, and that smokers who quit before age 40 reduce risk of death from smoking by about 90%
But the difference between Virginia and Burley tobaccos is significantly greater than just the genetic difference between the two plants