My friend loves smoking tobacco and weed he is at risk of dying from cancer?

That increases his chance to get cancer pretty badly :-(
Keep talking to him! Don't give up!

Yes he does...if he thinks he doesn't he is delusional and will one day find out

It is his choice but yes, smoking increases risk of a wide range of diseases including several types of cancer.

Yes, a two pack a day habit puts him at a very high risk of developing cancer if he keeps it up for a long time.

Yes. But only slightly more so that those who don't. Both increase the risks of cancer, but lots of people get it who live perfectly healthy lives.

I wish people would just mind their own business and learn to let others go to hell in their own hand basket. If he is smoking he knows the risks associated with it. There is literally no way to avoid knowing unless you are a complete and utter idiot.