Value | Category |
---|---|
1 | No, I have not used an electronic cigarette in the past 30 days |
2 | Yes, with nicotine in crystals or salts |
3 | Yes, with liquid nicotine |
4 | Yes, without nicotine |
5 | Yes, both without and with nicotine |
6 | Yes, but I don't know if with or without nicotine |
Sysmiss |