It's not just lifespan, it makes simple tasks more difficult, it induces chronic pain, forces you to alter your lifestyle to one that is more inhibiting, take medicine, contract diabetes, the list goes on (it really does). There is nothing right about it, and if people make a 'choice' like it, they should be at least notified of it. Never will I accept that kind of lifestyle, and neither should anyone else.
And for the former statement, lifestyle diversity is meaningless. Smoking characters can disappear from media entirely, I don't care. Obese people can disappear from media entirely, I don't care. These are superficial traits, and don't deserve any recognition in media. If it's there, then sure, whatever, but they aren't obligated to exist either.