However, the comparatively tiny doses used in hay-fever nasal sprays and most asthma inhalers are unlikely to have a significant impact.

The most toxic compounds are lethal even in tiny doses.

In tiny doses, the effects are minimal.

Phobias can be treated successfully with cognitive behaviour therapy, which usually involves gradually introducing the feared object in tiny doses to build up familiarity without panic.

But medical science has harnessed its power by using tiny doses.