(a)

WDFHFS^*

Always

Often

Sometimes

Rare

Never

In total

Smokers

6

(10.5)

11

(19.3)

18

(31.6)

11

(19.3)

11

(19.3)

57

Non-smokers

35

(2.7)

189

(14.3)

360

(27.2)

434

(32.9)

302

(22.9)

1320

χ²-test: χ²-cal = 16.109, df = 4, p = 0.003; Odds (Always, often vs Sometimes, Rare, Never) = 2.091

(b)

WDFHAW^**

Always

Often

Sometimes

Rare

Never

In total

Smokers

15

(26.3)

30

(52.6)

8

(14.0)

1

(1.8)

3

(5.3)

57

Non-smokers

258

(19.5)

495

(37.5)

300

(22.7)

197

(14.9)

71

(5.4)

1321

χ²-test: χ²-cal = 12.992, df = 4, p = 0.011; Odds = 2.186

(c)

WEFHFS^***

Always

Often

Sometimes

Rare

Never

In total

Smokers

4

(7.0)

9

(15.8)

10

(17.5)

16

(28.1)

18

(31.6)

57

Non-smokers

24

(1.8)

142

(10.7)

323

(24.5)

427

(32.3)

427

(30.7)

1321

χ²-test: χ²-cal = 9.924, df = 4, p = 0.041; Odds = 2.120

(d)

FFTS^****

Always

Often

Sometimes

Rare

Never

In total

Smokers

8

(14.0)

19

(33.3)

6

(10.6)

21

(36.8)

3

(5.3)

57

Non-smokers

101

(7.7)

338

(25.6)

401

(30.4)

34

(33.7)

34

(2.6)

1318

χ²-test: χ²-cal = 14.388, df = 4, p = 0.006; Odds = 1.728