Menthol is a chemical naturally found in peppermint and other mint plants, but it can also be made in a lab. First added to tobacco in the 1920s and 1930s, menthol reduces the harshness of cigarette ...
Concentrated oils or "dabs," meanwhile, can contain upwards of 95% concentration ... A six-year study found that teenage girls are five times more likely to develop depression or anxiety if they smoke ...