adding text into check box field

Consider this example in a FORM:

<p>I exercise less than 4 hours a week:
[checkbox exercise "Yes" "No"] </p>

<p>I drink more than 10 units of alcohol a week:
[checkbox alcohol "Yes" "No"] </p>

<p>I smoke more than 10 packets of cigarettes a week:
[checkbox cigarettes "Yes" "No"] </p>

Place the following in the MAIL Message Body:

I exercise less than 4 hours a week: [exercise]
I drink more than 10 units of alcohol a week: [alcohol]
I smoke more than 10 packets of cigarettes a week: [cigarettes]

Then check the box Exclude lines with blank mail-tags from output below the Message Body pane.

In this case if I complete the form as a user and check the exercise and cigarettes boxes, but don’t check the alcohol box, the output in the message would be something like:

I exercise less than 4 hours a week: No
I smoke more than 10 packets of cigarettes a week: Yes

So you only see the labels in the message for the boxes which have been competed, as well as the response.

http://contactform7.com/checkboxes-radio-buttons-and-menus/