Same boat with my SD. He smokes 1-2 PAD camel no filters. I have given him info and tobacco juices to try. He is not ready or does not want to give it a real go. I planted a seed. Now I have to step back and let it be. He can be stubborn and is very set in his ways and that is his right.
My advice would be to back off. He has the info he needs and knows where to get more. If you let it be for a bit he may come around on his own. Let it be HIS decision (he needs to be in control of this). The more anyone is harrassed and haraunged, the more resistant they will become to any idea.