Had tried quitting cigarette smoking before

Unadjusted OR
(95% CI)

Adjusted OR
(95% CI)

Demographics and health condition

Gender
  Female
  Male

Reference
1.32 (0.68- 2.60)

Reference
1.54  (0.69- 3.44)

Age, (years)
   ≦25
   >25

Reference
0.79  (0.46- 1.36)

Reference
1.13 (0.57- 2.24)

Occupation/major
  Medical field
  Non medical field

Reference
0.39 (0.20 –0.78)*

Reference
0.37 (0.17–0.81)*

What they felt during last week

Bothered by something
   Not at all
   Yes

Reference
2.01 (1.14–3.53)*

Reference
2.26 (1.11–4.60)*

Felt like something good was going to happen

   Not at all
   Yes

Reference
1.97 (1.11 –3.48)*

Felt down and unhappy
   Not at all
   Yes

Reference
2.22 (1.23–3.99)*

Reference
2.60 (1.27–5.36)*

Felt lonely, like having no friends

   Not at all
   Yes

Reference
2.20 (1.24 –3.92)*

Felt tired
   Not at all
   Yes

Reference
2.37 (1.23–4.59)*

Addicted level

Is it hard to keep from smoking where you are not allowed to?

   Yes
   No

Reference
2.32 (1.31 –4.10)*