As grandparents though, it doesn't really matter what we think because it's not our place to do anything about it. All we can do is express an opinion and take the consequences, if there are any.
We will all have different thresholds for what we feel is appropriate behaviour around our grandchildren. We will all have different experiences in our own lives to do with drug use, and many of us might have used drugs ourselves or had children who have used drugs to a greater or lesser extent. We will also have different attitudes towards alcohol and tobacco use and their place in our grandchildren's lives, not to mention the different views and attitudes in laws could hold and to which our grandchildren will be exposed. We have to trust their parents to care enough to put their welfare first. If we can't do that, we have some hard questions to ask ourselves and some hard decisions to make.
Anger management!!! Help needed.