Do you have any unhealthy habits? Write something about it.

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Regarding the subject, I have some bad habits.

>> Correct
First, when I sit the chair, I always cross my legs.

>> First, when I sit on the chair, I always cross my legs.
According to the doctor\'s opinion, this action can affect on my backbone.

>> According to the doctor\'s advice, this action has a bad affect on my backbone.

However this is convenient to me. so whenever I sit the chair, I forget doctor\'s advice.

>> However, this is convenient to me. So, whenever I sit on the chair, I tend to forget the doctor\'s advice.
Second, I enjoy chewing the gum. 

>> Correct
Of course, this habit can bad affect on my jaw.

>> Of course, this habit has a bad affect on my jaw.

But when I drive a car or I do my work in office, I often chew the gum to shake off sleepiness.

>> But when I drive my/a car or I do my work in the office, I often chew the gum to shake off sleepiness.
Third, I enjoy eating the spicy and salty foods.

>> Third, I enjoy eating spicy and salty foods.
I know that this is very bad habits undoubtedly.

>> Undoubtedly, these are very bad habits.

But I cannot quit the spicy and salty foods because I often relieve my stress by eating the stimulating foods.

>> But, I cannot quit eating spicy and salty foods because it is good for stimulation and it relieves stress.
There are many unhealthy habits which I have to correct besides above points.

>> There are many unhealthy and bad habits that I have to correct aside from the mentioned above.
For my health, I will try to correct my habits.

>> Correct