Most who are serious do not talk about it, but being under the influence can cause a person to do crazy things. Ask him these four questions:
- How does he plan to do it
- Where
- When
- Why
If he can answer at least 3 of these, then you know he is serious and encourage him to get professional help. A lot talk about it just to get attention or sympathy, but you never really know for sure.
Thank you for this advice. He is doing ok, and I have been in contact with him. If I'm ever confronted by someone talking suicidal, I will remember your advice.