- drugs (of any sort),
- gum (chewing or nicotene),
- junk food, or
- drugs (of any sort).
Did I mention "don't do drugs of any sort"?.
If you must smoke, don't smoke:
- in your car,
- in your house,
- around children (anyone's),
- anywhere it might be prohibited,
- anywhere it might be convenient (this will help you limit your numbers).