Western society is in no way closer to that point. What you're reading is the counterpoint to "a glass of wine a day is good for your health" when in fact it's not. People ask "how much can I drink without it affecting my health" and the honest answer is nothing. You're obviously right that any substance is more dangerous the higher the amount. You also can't tell beforehand what the exact risk is because this is a statistical question. But just because the outcome is not perfectly predictable doesn't mean there's no risk.