And what is pleasure?
Pleasure likewise pertains to the Good, since pleasure is a good.
But pleasure is not the only Good, and so any pleasure that is pursued contrary to a greater good is sinful, and any pleasure not contrary to a greater good is licit.
Sexual pleasure is a good, simply; but defiance of the right order of wedlock is a privation of a greater good than the pleasure itself is good, which is why sex out of wedlock is not licit.
So if I ask about opium, you'll contrive a reason why that's wrong. But if I ask about enjoying an apple, you'll contrive a reason why that's okay. So then if I try to blend the apple and opium examples, you'll say cut down the evil tree rather than fix it with science.
The pleasure of opium is out-balanced by the damage to the body, mind, and spirit of the user, as well as the damage to their relations with others - as any ex-opium addict will readily confess.
The of the apple is not itself outbalanced by any privation of a greater good; however, like with all goods, the virtue of temperance must be exercised. A deficiency of apples (or like foods) may lead to scurvy; an excess may cause other health issues like diabetes or low pH levels or sensitive teeth. But in itself the good of eating an apple balances well with other goods.
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