Second hand smoke is harmful for everyone but its even more harmful for children and babies. Kids have a faster breathing rate because they breathe in more air relative to their body weight, which means they absorb more smoke. Kids immune systems are also a lot less developed meaning a lot less weak to all the toxins exposed to them. Consequences to children and babies that are exposed to smoke will have ear infections, breathing problems, SIDS, pneumonia and many other diseases.
Thalia always waking up in the middle of the night from a nightmare and then looking everywhere to find Kael but she remembers that he was there to take of her when she had the nightmares because she was back home in Valdyrstal