mouth cancer due to chewing tobacco Consumption Early Signs of Mouth Cancer
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Additional evidence also supports increases in cardiac inflammation, oxidative stress, and fibrosis after prolonged exposure to electronic cigarettes, which was comparable to damage induced by combustible tobacco products [93]

One of these restrictions was raising the minimum age to purchase tobacco products from 18 to 21

Health Canada says experts are currently determining the way forward. Our government will continue to take action to protect the health of Canadians, and particularly youth when it comes to tobacco use in Canada, Health Minister Jane Philpotts press secretary Andrew MacKendrick said in a statement to Global News
Report for the Australian Government Department of Health

It causes oxidative stress in sperm cells, damaging DNA and reducing their quality