# If a child below the age of 12 has their finger tips and nails severed above the first crease of the first joint, they can regenerate. Regeneration takes about eleven weeks. Adults do not have this ability.

# Nicotine, a component of tobacco smoke, gets into the body very rapidly. With one puff on a cigarette, nicotine reaches the brain in seven seconds. This is several seconds faster than it takes alcohol to get into the brain. Even heroin, when it is injected into the arm below the elbow, takes twice as long as it does for nicotine to reach the brain.

# Statistically, one's life is shortened 14 minutes for every cigarette smoked.

# On average, a single cancer cell divides only once every hundred days. At that rate, owing to exponential growth (one cell dividing into two, two into four, four into eight, and so on), one cancer cell may take eight years to form a pea-sized tumor. But two years later, the tumor will be about the size of a cantaloupe melon and weigh more than a pound (half a kilo).

# Human adult males have four or five erections per night while sleeping. Each lasts about 10 minutes, if uninterrupted