breathing NOT AIR is bad for you, and breathing post-combustion particulates is even worse.
There are things you can you do to make them more healthy, but those things have been done already for the most part. For example the filter prevents you from aspirating burning coals and reduces the average size of the inhaled particles, reduction of the amount of additives, and other regulations have made the secondary effects less harmful.
E-cigarettes were supposed to “solve” this, and we all saw how that turned out.
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