Table 1 List of individual survey items used to construct reason for use subscales

User experience

 The level of effect I feel

0.84

0.78

0.86

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 How satisfied it makes me feel

 How long I feel the effect after use

 The control I have over how much I use

 The time it takes for me to feel the effect

 I like it

 The price

0.67

0.78

0.78

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 The taste

 The purity of the product

 The variety of product that is available to me

 The amount I need to feel the effect

 I can vape in places where I cannot smoke^a

0.67

0.79

0.66

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 It is convenient

 How easy it is to do

 I feel less judged by others about my use

 It might be less harmful to other people around me

0.85

0.89

0.94

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 It might be less harmful to my health

 I think vaping will help me to quit smoking^a

 I think vaping will help me to cut back on my smoking^a

 Using cannabis increases the buzz I get from nicotine

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0.78

 Using nicotine increases the buzz I get from cannabis

 I use nicotine when I cannot use cannabis

 I use cannabis when I cannot use nicotine

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0.76

 I have tried to reduce my use of nicotine by replacing it with cannabis

 I have tried to reduce my use of cannabis by replacing it with nicotine

 I use cannabis or nicotine in different places (home, school, work, bars, parties)

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0.78

 I use cannabis or nicotine around different people (friends, peers, family)

 I like to experiment with different products but do not use any regularly

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0.59

 I do not use cannabis or nicotine in any sort of sequence

 The use of one product had nothing to do with use of the other product