That's not true; many parents have misgivings about putting their children in situations likely to harm their body (gymnastics, or football, or hockey, or extre

That's not true; many parents have misgivings about putting their children in situations likely to harm their body (gymnastics, or football, or hockey, or extreme sports), or despair of other parents injecting children with growth hormones or steriods or pumping them full of creatine. Many adults are wary of those around them doing amphetamines or cocaine. Many women worry enormously (and hence avoid) potential health effects of HRT or the birth control pill, as it is associated with many reproductive cancers among other diseases. Many men avoid steroids and testosterone; it causes problems with the heart and circulatory systems, and it can make you bald. Surely the magnitude of fear people feel with regard to drugs versus activities is higher. This is probably instinctive: they are a lot of things one can have put into one's body, and throughout evolution, most were pretty bad. But the drugs and training regimens and lifestyles are not in principle distinct. To the extent we can have equally complete knowledge of their effects (which we probably can't), we should judge them the same.