But if you are litteral smoke, they wont

You have to sleep at some point...

But you are still smoke

Ok but they will always follow you and if they can't kill you then they will look for your family

No if i killed my family

Remember in Alabasta, Luffy accidentally crashes into Smoker through many walls when Smoker was unaware?

But if you train your fruit a certain amount(like crocodile) you can transform when attacked even if you are unaware

Ya it's actually ambiguous. There were surely times when logia users pre-timeskip were attacked when unaware and it passed through... Maybe Luffy unknowingly used armament haki that time....

No, it just depends on the person

Nah smoke is just bad as a logia bc think about smoke, its a gas, a GAS, the only thing you can do is choke someone to death irl, and its impossible to keep a cloud of smoke around someone while fighting. The only reasonable reason to choose smoke is for the immunity against physical attacks