I knew this one was coming, so I had the obvious answer:
It’s not poison, but incense.
Seriously, do you notice that smoking is not mentioned in the scripture? That makes using this passage as a blanket condemnation of all smoking an
application of the scripture, subject to individual circumstance. Since it does not mention smoking, it is not an
interpretation of this scripture to apply it to smoking.
There are definitely many factors that can make smoking defile the body more, like smoking to a dangerous level, smoking when one has lung cancer or other smoking related ailment, or other aggrevating health factor.
I think the catechism may give us the best way of putting it. It
may be a sin. Just as eating salty food may be to one with high blood pressure, or getting second helpings to one who is overweight may be a sin.