Why do tobacco try to quit the habit

Because it has many different negative affects. Smoking can cause heart problems, respiratory problems, chronic cough, yellow teeth, mouth and lung cancer and has so many carcinogens you ingest. Dipping (smokeless tobacco) causes gums to recede, yellow teeth, mouth ulcers, and hasn't been proven yet but it could cause mouth cancer buts its very unlikely to happen. Still both are nasty habits and it would highly benefit someone to quit. People use nicotine gum, nicotine patches, chantix and other things to quit. People who use smokeless tobacco also buy nicotine and tobacco free flavored dip to help them quit. It doesn't have the harmful ingredients regular dip has. Smokeless tobacco users also often buy "coffee chew" to help them kick the tobacco addiction while still having something in their lip and the coffee gives them energy

It kills you. rots your teeth and gives you all kinds of cancer. people who are trying to quit use gum

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.