taking smoke shells away from the nebelwerfers would be rather silly, as that was a primary design goal for the things, as well as gas (most armies that had specialist gas units tended to call them "smoke" units). Even if they ended up as HE chuckers more often than not, the smoke shell was still available.
e.g -
lone sentry
Quote:
The Nebelwerfer 41 can fire three different types of projectiles: high-explosive shells, incendiary projectiles, and smoke projectiles.
The high-explosive shells include those with supersensitive fuzes and those with delayed-action fuzes. The latter can penetrate reinforced cover. Because of their fragmentation and concussion effect, high-explosive shells are used primarily against personnel. It has been found that the concussion has not only been great enough to kill personnel, but occasionally has caused field fortifications and bunkers to collapse.
The incendiary projectiles are psychologically effective, and under favorable conditions can start field and forest fires.
The smoke projectiles are used to form smoke screens or smoke zones.
[This Die Wehrmacht article naturally does not discuss the possible use of gas-charged projectiles.]
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Also
Lone sentry second article
And finally - I found some reprints of the US Army Intelligence Bulletin at this site - may be of interest
WW" Intelligence Bulletins
Cheers
Andy