Table 2

Weighted cross-sectional associations between past 30-day tobacco use and lifetime asthma diagnosis at wave 2 of the PATH Study*

Risk factor at wave 2N†US population %Lifetime asthma diagnosis %Models predicting asthma
Model 1
Combustible versus non-combustible tobacco use
Model 2
Specific tobacco products used
Adjusted RR‡95% CIAdjusted RR‡95% CI
Past 30-day tobacco use
 Combustible versus non-combustible tobacco use
  Never used tobacco201030.511.2RefRef
  Formerly used tobacco323134. to 1.38
  Non-combustible use only3923. to 1.55
  Any combustible use463432.412.31.020.83 to 1.24
 Specific tobacco products used
   Yes323134. to 1.36
   Yes370825.912.10.980.83 to 1.15
   Yes164510.814.51.171.00 to 1.36
   Yes9846.213.50.990.81 to 1.20
   Yes13239.112.70.990.83 to 1.19
   Yes5764.312.51.080.84 to 1.40
Other smoke-related exposures
    Cigarette pack-years
    (per each 5 pack-years)
10 2670.970.89 to 1.060.980.90 to 1.07
    Past-week SHS exposure
    (per each 5 hours/week)
10 2671.010.99 to to 1.03
 Past-month marijuana use§
  Yes222515. to 1.501.261.07 to 1.48
Relevant medical history
 Body mass index
  Underweight3362.810.70.950.65 to 1.390.950.65 to 1.40
  Overweight290630.312.11.191.01 to 1.401.191.01 to 1.40
  Class 1 obese152114.612.51.251.00 to 1.561.251.00 to 1.56
  Class 2+ obese121212.016.41.621.30 to 2.021.621.30 to 2.01
  • Online supplemental table 9 reports SEs for all the weighted estimates presented in this table and adjusted RRs for all the variables in the model.

  • *N=10 267 wave 2 adult (age 18–39) respondents without chronic obstructive pulmonary disease or other non-asthma respiratory diseases at waves 2–4, with wave 4 PATH Study longitudinal (all waves) weights, and complete data on all analytical variables.

  • †Unweighted.

  • ‡All RRs adjust for the variables in the table plus age, sex, ethnicity/race, education and lives in an urban area. Bold RRs are statistically significant at p<0.05.

  • §Marijuana use variable does not distinguish between combustible and non-combustible use.

  • PATH, Population Assessment of Tobacco and Health; RRs, risk ratios; SHS, secondhand smoke.