Smoking is a selfish act that is immoral. Second-hand smoke causes cancer. Cancer is a horrible disease and by smoking you increase the chance that someone around you will get it.
Suicide is legal. Suicide bombing, not so much. And yet that is what smoking is, basically: Killing yourself and taking in innocent bystanders.
You can't masturbate in public. You can't masturbate in front of your children. Both can cause significant psychological trauma. Smoking can cause physical trauma and yet is legally and socially acceptable.
Smoking is also a fire hazard. So even if you live alone, smoking puts your neighbors and firemen at risk. And for what? Your own personal "pleasure". Pleasure that decreases significantly with time.
People who are addicted to nicotine can use nicotine gum and/or nicotine patches. They could even start using chewing tobacco if they wanted to. But smoking is unacceptable.
Smoking should be illegal.
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