It might be beneficial to show passages against addictions (including cigarettes/cigars/tobacco use).

Some are:

1 Corinthians 6:12 All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.

1 Corinthians 10:23 All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not.

Smoking fails both of these verses: it brings someone under its power, and does not edify them (spiritually or physically).

One verse that is great for resisting temptation and addictions:

Philippians 4:13 I can do all things through Christ which strengtheneth me.