Which factor is a strong internal influence on one’s feelings and behavior regarding drugs? (points : 1) one’s feelings about oneself environmental and family stresses the behavior of friends the behavior of admired celebrities question 9. 9. which is an external influence on one’s behavior and feelings about drugs? (points : 1) a parent’s behavior one’s past experiences one’s social tendencies one’s personality

For the first question, the options are:

one’s feelings about oneself
 environmental and family stresses
 the behavior of friends
 the behavior of admired celebrities

The key word in this question is "internal", it's looking for internal influence.  This means:

one’s feelings about oneself

The second question has the options:
a parent’s behavior
one’s past experiences
one’s social tendencies
 one’s personality

Here you need an "external" influence: this would be the following option:
a parent’s behavior

Correct textbook answers would be 1,3, and 5