Table 3.

Cannabis use history and patterns of use (n=39).

	n (%) or Median (IQR)
Age when started using cannabis (y)†	15.7 (13.8, 18.0)
Age first daily cannabis use (y)*	18.4 (16.0, 21.3)
Time from start daily use to development of cyclic vomiting (y)*	4.7 (1.8, 8.8)
Frequency of cannabis use before age 16*
Never	11 (29%)
1–4 times per y	11 (29%)
Once a month	2 (5%)
2–6 times per week	6 (16%)
Once a day	0
More than once a day	8 (21%)
Frequency of current cannabis use*
More than once a day	32 (84%)
Once a day	4 (10%)
5 – 6 times per week	1 (3%)
3 – 4 times per week	1 (3%)
Days past month cannabis use	29 (25, 30)
Number use sessions per day on typical weekday use cannabis	3 (2, 4)
Number use sessions per day on a typical weekend use cannabis	4 (3, 5)
Time from waking up to cannabis use*
Immediately	3 (8%)
Within 30 minutes	12 (31%)
Within 1 hour	4 (10%)
1 – 3 hours	13 (33%)
3–6 hours	2 (5%)
6–9 hours	3 (8%)
12–18 hours	1 (3%)
Primary method of cannabis use
Blunts	18 (46%)
Bong	6 (15%)
Joint	9 (23%)
Vaporizer	2 (5%)
Other
Spliff	2 (5%)
Dab	2 (5%)
Primary form of cannabis use
Marijuana (flower)	35 (90%)
Concentrates	4 (10%)
Average THC content of cannabis used
0%–9%	2 (5%)
10%–19%	8 (21%)
20%–30%	12 (31%)
Greater than 30%	2 (5%)
Unknown average	15 (38%)
Source of cannabis*
Non-dispensary (eg, dealer, seller)	21 (54%)
Legal dispensary (medical)	5 (13%)
Legal dispensary (recreational)	10 (26%)
Other	2 (5%)

^*Data missing for one participant (n=38).

^†Data missing for 2 participants (n=37).