Effects of tobacco

Low to moderate doses
Some of the effects that may be experienced after smoking tobacco include:

initial stimulation, then reduction in activity of brain and nervous system
increased alertness and concentration
feelings of mild euphoria
feelings of relaxation
increased blood pressure and heart rate
decreased blood flow to fingers and toes
decreased skin temperature
bad breath
decreased appetite
dizziness
nausea, abdominal cramps and vomiting
headache
coughing, due to smoke irritation.

Long-term effects
Tar in cigarettes coats the lungs and can cause lung and throat cancer in smokers. It is also responsible for the yellow–brown staining on smokers’ fingers and teeth.

Carbon monoxide in cigarettes reduces the amount of oxygen available to the muscles, brain and blood. This means the whole body—especially the heart—must work harder. Over time this causes airways to narrow and blood pressure to rise, which can lead to heart attack and stroke.

High levels of CO, together with nicotine, increase the risk of heart disease, hardening of the arteries and other circulatory problems.

Some of the long-term effects of smoking (Quit Victoria, 2010) that may be experienced include:

increased risk of stroke and brain damage
eye cataracts, macular degeneration, yellowing of whites of eyes
loss of sense of smell and taste
yellow teeth, tooth decay and bad breath
cancer of the nose, lip, tongue and mouth
possible hearing loss
laryngeal and pharyngeal cancers
contributes to osteoporosis
shortness of breath
coughing
chronic bronchitis
cancer
triggering asthma
emphysema
heart disease
blockages in blood supply that can lead to a heart attack
high blood pressure (hypertension)
myeloid leukaemia, a cancer that affects bone marrow and organs that make blood
stomach and bladder cancers
stomach ulcers
decreased appetite
grey appearance
early wrinkles
slower healing wounds
damage to blood vessel walls
increased likelihood of back pain
increased susceptibility to infection
lower fertility and increased risk of miscarriage
irregular periods
early menopause
damaged sperm and reduced sperm
impotence.