From: Alcohol and cannabis use as risk factors for injury – a case-crossover analysis in a Swiss hospital emergency department
RR
95% CI lower
95% CI upper
cannabis use
no
1
yes
0.33
0.12
0.92
dose response
no use
less than 1 pipe or joint
1.45
0.34
6.23
1 pipe or joint
0.11
0.01
0.89
more than 1 pipe or joint
0.03
0.00
0.44