This is not true.

A man may become a drunkard by the use of alcohol, and yet he is more likely to have consumption than he would have been if he had been a total abstainer.

"Drunkard's consumption" is one of the most dreadful forms of this disease.
SUMMARY.
1.

Pure air is as necessary as food and drink.
2.

Anything which is rotting or undergoing decay causes a bad odor, and thus makes the air impure.
3.