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The chemicals in cigarettes can irritate your throat and cause inflammation in your throat tissue and nose, limiting how much air you take in when you sleep

While the effects may be less severe than for active smokers, consistent exposure to secondhand smoke can still negatively impact hair quality and growth

Feel free to substitute bleu cheese with feta or goat cheese if preferred

NPG of California

An example counterfactual question given in the book is Would Kennedy be alive if Oswald had not killed him? and What if I had not smoked for the last 2 years? We can test for causation by running experiments that track each variable while also excluding other variables that might interfere