Your respiration and heart rate increases which can lead to something more serious. Your taste buds are dulled and your appetite is reduced, this could lead you to not eat and not consume your daily diet which can lead to you being underweight and survive only with cigarets. It can obviously cause bad breath, yellow teeth, smelly hair and clothes due to the smoke.
For long term effects, you can have cancer of many forms, you would also have various lung problems, chronic bronchitis, obviously a weakened immune system, heart diseases, and strokes. Sad thing is, people already know these information about how bad it is for their health, yet, they still want to smoke, they would ignore the warnings on the cigaret package as if it were a useless fact.
Other consequences is its cost to society, tobacco related illnesses cost the US about $165 billion each year, imagine all the countries combined. Also, smoking one pack a day will spend about $1500 a year on the habit as well as selling products to minors is illegal using tobacco at school and can lead to suspension. So legal consequences are included as well. So why risk your life? there are many benefits of living tobacco free, you would be less stressed, feel healthier, and look and feel better