smoking cigarettes cause lung cancer is the number one of cancer. It causes about 90% of lung cases. Tobacco smoke contains many chemicals that are known to cause lung cancer. If you still Campaign - Smoking causes most
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Maybe you do start thinking about your nutrition, and it doesn't mean restricting for the first time or cutting out foods, that just means understanding: am I eating enough
It affects respiratory health

Polycyclic aromatic hydrocarbons Polycyclic aromatic hydrocarbons (PAHs) are chemicals found in coal, crude oil and gasoline, according to the CDC
In short: Yes, quitting smoking can cause depression, and in fact, its quite common to experience mood changes after you quit
Taking cigarette breaks can be a social thing as well
