Examples:

• And you? Do you smoke?
• What kind of cigarettes do you smoke?
• Since when do you smoke at school?
• How many cigars do you smoke a day?
• Since when do you smoke that stuff?
• How much do you smoke a day?
• Why do you smoke now?
• Why do you smoke marijuana?
• First of all, why do you smoke?
• What cigarettes do you smoke?