Smoking is a known carcinogen with a known increase in death rate on top of all of the things you listed. In fact smokers probably also have the exact same air quality and environmental dangers that you listed but have added smoking on top of that.
Sure, have fun, it's your life. Smoke away. Just don't believe lies about "organic tobacco" being healthy for you. It's not.
Offering snark at someone else's conscious bad habit that affects nobody but themselves and other smokers who opt-in strikes me as silly. Smoking has been successfully regulated, though minor vigilance is required to make sure tobacco companies don't try and undo regulation. There are many worse things that Americans partake in all the time that are untaxed, unlabelled, and only minorly regulated that will have much better public health outcomes than continually shining a spotlight on smoking and will be a better use of our collective moral and political capital as a country.
Nobody is saying that cigarettes or nicotine is healthy. The warnings exist and are highly popular. Smoking bans in public places in the many US states are generally very popular in those states. The "poetic" poster talked about how cigarettes are bad multiple times. But as adults with full knowledge of the risks of something, these adults can still engage in these activities in ways that are not posing risks to other. That's what it means to be an adult.
The moral panic around secondhand smoke is what bothers a lot of smokers. Having smoked in the past I will often join smokers to outdoor areas where they smoke just to chat without partaking and the restrictions are often really difficult to work around so I understand where the opinion comes from, even though I'm a fan of the restrictions generally.