Caleb has poor eye sight from cataracts, a constant cough, and restricted blood flow in some vessels. Which drug does caleb most likely abuse.

Hallucinogens
Alcohol
Tobacco
Steroids

Based on the symptoms provided, it is more likely that Caleb abuses tobacco. Poor eyesight from cataracts is not typically associated with the abuse of hallucinogens, alcohol, or steroids. Additionally, a constant cough can be a consequence of smoking tobacco, as it is known to cause respiratory problems. Restricted blood flow in some vessels can also be associated with smoking tobacco, as it can lead to cardiovascular complications.