is chewing tobacco addictive smokeless safer than cigarettes? Youth Tobacco Addiction: Early Signs,

Extreme air pollution conditions adversely affect blood pressure and insulin resistance: the air pollution and Cardiometabolic disease study

People with pre-existing conditions, such as lung and heart disease, are more vulnerable to the effects of wildfire smoke

When steadfastly implemented, the new set of warnings carry a high shock value that can reiterate the health dangers associated with tobacco use and are also strong enough to cause tobacco addicts to begin to break the yoke of the self-harming addiction

So its not as effective, but it may be more usable long term. As for most other health problems, few good studies have been done