Table 3 Categories and questions used

Cannabis use and consumption characteristics

Have you used cannabis?

In what circumstances did such use take place?

When was the first time you used cannabis? Age. Situation. How it affected you. Consequences. Emotions.

Predisposing Factors

What aspects make a person start using cannabis? Do you think that the way girls use cannabis differs from that of boys? To what extent?

When you started using, what was your life like? What aspects make a person start using cannabis? Do you think that the way girls use cannabis is different from that of boys? To what extent?

Cognitive factors

What do you know about cannabis?

What did you know about cannabis before you started using? How has this knowledge changed from before you started using to now?

To what extent do you consider the use of cannabis to be dangerous? What dangers and consequences do you perceive from the use of this substance? How likely would you be to suffer such consequence if you were to use cannabis?

To what extent did you consider cannabis use dangerous? How has this perception changed from before you started using it until now?

What would you tell a friend, brother or sister if they asked you about this?

Motivational Factors

Attitude

What advantages or disadvantages do you see in the use of cannabis? How could your opinion about the advantages change?

Advantages and/or disadvantages of cannabis use.

How has this perception changed since before you started using until now?

Social influence: model

With whom do you usually use cannabis? Do you know people around you who use it?

What were your friendships like? Who did you hang out with? Did you change your friendships because of cannabis use? What was your opinion about people who used cannabis? How did you meet them? Did you know people around you who used cannabis? Who did you use cannabis with? How has this situation changed today? What are your friends and inner circle like?

Social influence: social norm

Who do you think approves cannabis use and who disapproves? Do the people around you think you should or should not use cannabis?

Were there any people around you who approved cannabis use? And did any people around you disapprove it?

Were there any people whose opinion affected you? Why?

Whose opinion affects you the most now?

Social influence: social pressure

Have you ever felt pressured to use cannabis? In what situation and with whom? If not, what situations do you think might put you under pressure to use? How could you act to avoid that situation or pressure from those people?

Have you ever felt pressured to use cannabis? If so, in what situation and by whom?

If not, what situations do you think may put you under pressure to consume?

Do you feel pressured by someone?

How do you think you could act to avoid that situation or to avoid pressure from those people?

Self-efficacy:

In what situations do you think it is difficult to say no to cannabis use? What degree of difficulty do you face in each place (a party, a bar, a friend’s house, in the street, etc.)?

Situations that made it difficult to say no to cannabis use. Which do you consider to be risky for use?

Action

What plans do you think you could make to avoid using cannabis and to avoid peer pressure?

What strategy have you used or would you use to stop people from using? Are there any alternatives to cannabis use?

What do you currently do to be able to refuse consumption in these situations?

Do you have friends who use? Have you suggested that they stop smoking joints? Have you succeeded? What strategy have you used so that they stop using?

Family Factors

When you go out partying or with friends, do your parents know where you are and who you are with? Are your parents aware of what you are doing?

Did your parents know where you were? Did they check your arrival time? Did they know who you were with? What other rules did you have at home? Did your parents know you were using drugs?

Have these situations changed?

What do your parents think about cannabis use? And if you consume it, how do they or do you think they would react to this situation?

What do you think your parents thought about your cannabis use? How did they react when they found out about your use? What is your parents’ attitude towards you and your achievements? Have your thoughts changed as a result of their attitude?

Do your parents consume any substance at home (alcohol, tobacco, cannabis, etc.)? In what situations do they do it? If you use alcohol, tobacco or cannabis at home, are your parents with you? If so, in what situations or occasions? Have your parents ever offered tobacco or cannabis to you?

Do your parents use alcohol, tobacco, cannabis or other drugs? Do they use them in front of you? Have you ever used alcohol or other drugs at home? Were your parents there?

Have you ever been offered alcohol or other drugs?

Has your parents’ behavior changed?

Have you ever had a conversation with your parents about substance use (alcohol, tobacco, cannabis)? What did you discuss?

What was your relationship with your parents like? How did you feel about them?

Did you talk to them when you first became aware of your use problem? Were your parents the ones who made you aware that you had a problem with cannabis? How did you feel about discussing the use problem with your parents?

How have these situations changed? What is your relationship with them?