Write or Wrong, you buy cigarettes for your son? Why is that? As far as job hunting, you can help him out by inquiring for him, the worst that can happen is that he will say no.
It is very normal to look back at the time when he was frum and feel bad about what he is up to now. But Boruch Hashem he is healthy and alive. I am so sad for the families that lost their children and grandson in the car crash in williamsburg. Boruch Hashem your son is alive and IY”H will come back to yiddishkiet very soon. Keep hoping and praying.