I remember Camel, Chesterfield, Kent, Kool, Lucky Strike, Pall Mall, Salem, and Winston, although there might have been others
It was announced in March and took effect in May
While I suggest in a comment at the PLoS ONE study site that we are seeing category crossover due to the studys dependency destroying definition of cold turkey ("gave up cigarettes all at once" instead of the actual definition, "abrupt complete cessation of the use of an addictive drug"), Table 7 footnotes indicate that there was also "missing data." Regardless, cold turkey crushed the competition
give your teen space to attend therapy sessions or support group meetings on their own
This disparity is concerning given the relationship between mental health and nicotine