&gt; Drug use is illegal and is taboo. Many people who take drugs are not going to talk to you about it.<p>Indeed. As has been well known in the addiction literature for a long time now, the overwhelming majority of addicts just sort of... get over it. The addicts that show up more prominently are a very selected subgroup. To give an example that will doubtless be familiar to many HN commenters personally, modafinil is used more widespreadly than it is acknowledged; in the survey I&#x27;m running now, most respondents just use it practically with no drama or mess.