Molest:
to annoy, disturb, or persecute especially with hostile intent or injurious effect
I would argue that a smoking parent definitely has hostile intent and is most assuredly annoying. Science has shown that second hand smoke kills and to smoke around a defenseless kid is definitely a form of molestation.
A little smoke to your lungs day after day and you have a life time of increased stroke risk, lung cancer, coronary heart disease, reproductive issues, SIDS, lower respiratory illness, impaired lung function, middle ear disease.
The parents are the primary source of protection for a child. Smoking parents are slowly killing their kids and saddling them with lifelong health issues.
A responsible gun owning parent is not putting lead into the brain or heart of their child.