The person that habitually exploits is called explorer.
a player
busybody
That person would be called a drunk. If s(he) was unable to stop drinking, that person would be called an alcoholic.
delayedslowtardy
A person who habitually complains or grumbles.
A barfly is a person who habitually frequents bars or similar drinking establishments.
That would depend on the habit. Habitually biting your fingernails is likely to have different results from habitually drinking a liter of vodka a day.
An automaniac is a person who has automania, enthusiasm for cars or car racing. It can also refer to a person who habitually hogs the road.
i see no point in expostulating with a person who habitually refuses to listen to reason.
A bedwetter is a pejorative term for a person who habitually urinates in his or her own bed while sleeping.
A person who is habitually cruel or overbearing, especially to smaller or weaker people, or thug
Yes, you can still go to heaven if you habitually sin. If a person believes in God, accepts him into their heart, and really tries to live like him (even with flaws), they can still go to heaven.