how to tell if someone smokes cigarettes

how to tell if someone smokes cigarettes 8 skin signs of SMOKING Light Smoker vs. Heavy Smoker:

Name: how to tell if someone smokes cigarettes 8 skin signs of SMOKING Light Smoker vs. Heavy Smoker:
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Cigarette beetles are commonly found in tobacco and other processed foods such as spices, flour, meal, and dog food, but can also attack horn, wool, hair, hide, pharmaceuticals, and even book bindings

If the difference was significant and the variables had three or more groups, we used standardized residuals of chi-squared to determine which group contributed to the significant difference