A reader writes:
Being a teen myself, I don't think it would be entirely accurate to associate the prevalence of marijuana use over cigarette use with merely the relative difficulties of obtaining them. I know a lot of people who smoke pot regularly, up to several times a day, but who don't smoke cigarettes simply because they don't like them. There's the health issues, the addiction, the odor and staining of teeth, gums, fingers etc., the general increasing social stigma towards cigarettes (and opposite trend in regards to marijuana) and, probably a big component, the relative lack of high. Why spend money on a pack of cigarettes that will kill you faster while getting you less high?