Cocaine

Cocaine is a shrub native to the Americas . The natives use it for warding off tiredness . It has a pleasant stimulative effect . It is present in the leaves and other parts of the plant . The traditional method of ingestion is by chewing the leaves . This is the safest method . Making a drink is also safe . 

Cocaine powder is a cheap way of making an unsafe drug . HCl is used in the manufacture , often without proper measuring tools . The result is an acidic powder which when inhaled causes burning or corrosion of the nasal structures . This method is not safe .

Two real problems with smoking

Emphysema is a real problem with smoking too much . Under eleven smokes a day is manageable . 

The problem is that smoking is additive . You tend to want to smoke more and more . Also it can cause habits of breathing - too much or too little breathing .

So manage your time . Make sure you have enough hobbies and occupations . Do volunteer work , get out of the house , go for a walk , go to the park . Boredom leads to bad habits .