Just vape and use eatables, and avoid any potential problems entirely.

Cannabis is an expectorant, which is why it causes the hacking cough. Like all smoke, there is also lung irritation, but the coughing just after taking a bong hit is, in part, an expectorant effect.

(Sorry about trotting out a study from 1975, but cannabis resarch is kinda stifled at the moment...)

[link to www.druglibrary.org]

Our present findings and those previously reported (1-3) demonstrated acute airway dilatation after smoked marijuana. In contrast, mild, but significant, reductions in forced expiratory flows and SGaw after chronic, heavy marijuana smoking were recently reported (24), suggesting airway obstruction secondary to a chronic irritant effect of the smoke. An acute, deleterious effect of the gas phase of marijuana smoke on alveolar macrophages has also been demonstrated in vitro (25). Consequently, smoking would not appear to be an appropriate long-term method for administration of bronchodilator cannabinoid compounds for potential therapeutic purposes. Although ingestion of Delta 9-THC in a sesame oil vehicle has produced bronchodilatation in asthmatic patients (3), less dilatation was noted than that after smaller doses of Delta 9-THC delivered by smoking (3).