Do you think that friends can influence one to take alcohol/drugs?

Do you think that friends can influence one to take alcohol/drugs? If yes, how can one protect himself/herself from such an influence?
Yes, a friend can influence one to take alcohol/drugs.
Steps to avoid influence of drugs/alcohol are:
(i) Avoiding the company of friends who take drugs or alcohols.
(ii) Seeking help from parents, teachers and friends.
(iii) Proper knowledge and awareness about alcohol and drug abuse.
(iv) Not experimenting with drugs and increasing the will power to beat the curiosity.
(v) Taking immediate medical help and counselling, if required.