are cigarettes a gateway drug Drug? Gateway effects and electronic cigarettes
Description
Vape pens also tend to use replaceable coils, which will need to be switched out every 1-3 weeks, depending on usage

Results obtained making a modification to the PGW method proposed by Rostron [49], discussed in [50], are included in the Additional file 1

Smoking and mortality from tuberculosis and other diseases in India: retrospective study of 43,000 adult male deaths and 35,000 controls
Then the researchers followed up, asking respondents about their use of other substances over the past year
