Table 5 Post hoc analyses of effects of use factors on perceived risk of cannabis use

Frequency vignette predictor

Overall risk of harm

Daily—almost daily

− 0.32

− 3.05

0.007

− 0.29

Daily—weekly

0.75

7.68

 < 0.001*

0.74

Almost daily—weekly

1.07

10.56

 < 0.001*

0.99

Cognitive health

Daily—almost daily

− 0.15

− 2.29

0.059

− 0.22

Daily—weekly

0.28

4.14

 < 0.001*

0.39

Almost daily—weekly

0.43

6.45

 < 0.001*

0.60

Physical health

Daily—almost daily

− 0.17

− 2.57

0.028

− 0.25

Daily—weekly

0.18

2.91

0.010

0.28

Almost daily—weekly

0.35

5.41

 < 0.001*

0.52

Mental health

Daily—almost daily

− 0.12

− 0.97

0.595

− 0.10

Daily—weekly

0.28

2.48

0.036

0.22

Almost daily—weekly

0.39

3.53

0.001*

0.33

Polysubstance vignette predictor

Overall risk of harm

Cannabis—cannabis and tobacco

− 0.36

− 0.36

 < 0.001*

− 0.36

Cannabis—cannabis and alcohol

− 0.21

− 2.07

0.097

− 0.21

Cannabis and tobacco—cannabis and alcohol

0.15

1.45

0.314

0.14

Physical health

Cannabis—cannabis and tobacco

− 0.23

− 3.896

 < 0.001*

− 0.37

Cannabis—cannabis and alcohol

0.01

0.10

0.994

0.00

Cannabis and tobacco—cannabis and alcohol

0.24

3.82

 < 0.001*

0.37

Method of consumption vignette predictor

Overall Risk of Harm

Edibles—vape

− 0.61

− 5.29

 < 0.001*

− 0.53

Edibles—smoke

− 0.69

− 6.13

 < 0.001*

− 0.59

Vape—smoke

− 0.08

− 0.64

0.801

− 0.07

Physical health

Edibles—vape

− 0.74

− 11.30

 < 0.001*

− 1.11

Edibles—smoke

− 0.74

− 11.54

 < 0.001*

1.10

Vape—smoke

0.00

0.07

0.997

0

Family history vignette

Overall Risk of Harm

Psychosis—substance use disorder

0.13

0.99

0.583

− 0.04

Psychosis—no family history

0.65

4.75

 < 0.001*

0.40

Substance use disorder—no family history

0.52

3.84

 < 0.001*

0.45

Potency vignette

Overall risk of harm

25% THC and 0.05% CBD—5% THC and 10% CBD

0.53

4.79

 < 0.001*

0.48

25% THC and 0.05% CBD—45% THC and 0.1% CBD

− 0.30

− 2.68

0.021

− 0.28

5% THC and 10% CBD—45% THC and 0.1% CBD

− 0.83

− 7.61

 < 0.001*

− 0.78

Cognitive health

25% THC and 0.05% CBD—5% THC and 10% CBD

0.27

3.86

 < 0.001*

0.37

25% THC and 0.05% CBD—45% THC and 0.1% CBD

− 0.19

− 2.69

0.020

− 0.29

5% THC and 10% CBD—45% THC and 0.1% CBD

− 0.47

− 6.67

 < 0.001*

− 0.69

Physical health

25% THC and 0.05% CBD—5% THC and 10% CBD

0.47

6.53

 < 0.001*

0.65

25% THC and 0.05% CBD—45% THC and 0.1% CBD

− 0.12

− 1.62

0.237

− 0.18

5% THC and 10% CBD—45% THC and 0.1% CBD

− 0.59

− 8.27

 < 0.001*

− 0.83

Mental health

25% THC and 0.05% CBD—5% THC and 10% CBD

0.35

3.02

0.008

0.31

25% THC and 0.05% CBD—45% THC and 0.1% CBD

− 0.26

− 2.37

0.048

− 0.24

5% THC and 10% CBD—45% THC and 0.1% CBD

− 0.61

− 5.70

 < 0.001*

− 0.56