The Stranger smokes a total of 4 cigarettes throughout the entire film. The first three being hand rolled and you can tell that they are totally not fun to smoke since The Stranger only takes one puff and throws it away and also looks disgusted. Towards the end of the movie he finally has a real cigarette and you can tell he is much more pleased.
According to Tony Anthony, the role of En Plein was originally considered for Klaus Kinski, who didn't get the role due to a near-fatal accident at Cinecittà Studios. The horse he rode as part of his audition had been unridden for many months due to being sheltered over the recent winter. While Kinski was on horseback, the skittish animal jumped, lurched, pinned him against a wall and fell on top of him, crushing him with its entire bodyweight on the steps of a saloon set. X-rays revealed that the actor's spine was cracked, and he had narrowly avoided getting paralyzed for life. The role of En Plein went to Dan Vadis, and Kinski received no compensation for the incident because the producers did not have insurance. Weeks later, Kinski defied his doctor's orders to not exert himself or ride a horse by playing the role of a villain in the pseudo-Western Man, Pride & Vengeance (1967).