Narrative:

On takeoff roll above 100 knots we smelled a plastic/acrid smell; continued takeoff assuming an oven issue. Shortly after takeoff flight attendant (flight attendant) called the cockpit and informed us that they smelled fumes and there was smoke/haze in the cabin; no ovens on and smoke was getting worse. We [advised ATC] and began our return to ZZZ. We switched roles in the cockpit; I became the pilot monitoring and first officer (first officer) assumed flying pilot. We requested rescue equipment assistance on landing. My concern was the smoke getting worse in the cabin; just slight fumes in the cockpit; I believe the safest route was to get the aircraft on the ground as soon as possible. We expedited an approach checklist and set up for a visual approach backed up with an ILS.during the approach the flight attendants informed us that the smoke was dissipating; although; they could not point to place where the smoke/fumes were coming from. Also; they assured us that it was not coming from the lavatory trash cans. I informed them that we will be landing in less than 5 minutes and prepare for landing and to inform us if the situation gets worse. I informed them that rescue equipment would be waiting for us as we landed.we landed and used the high speed taxiway. Once we stopped; I made an announcement to remain seated to the passengers; as the flight attendants informed us that smoke and fumes had subsided. Rescue equipment was on a dedicated frequency. They did their inspection and found no signs of external problems.we began our taxi to return to the gate when the flight attendants informed us that the fumes and smoke had returned. Also; they informed us that a passenger said there is a dark spot on one of the right flaps. With this information we shut down the #2 engine; once this was accomplished the smoke and fumes ceased.we continued and parked at gate with no other complications or issues.

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Original NASA ASRS Text

Title: B737 Captain reported after takeoff there were fumes and smoke in the cabin. Captain returned for an expeditious landing and reported that after number 2 engine shut down on ground; smoke and fumes ceased.

Narrative: On takeoff roll above 100 knots we smelled a plastic/acrid smell; continued takeoff assuming an oven issue. Shortly after takeoff Flight Attendant (FA) called the cockpit and informed us that they smelled fumes and there was smoke/haze in the cabin; no ovens on and smoke was getting worse. We [advised ATC] and began our return to ZZZ. We switched roles in the cockpit; I became the Pilot Monitoring and First Officer (FO) assumed Flying Pilot. We requested Rescue Equipment assistance on landing. My concern was the smoke getting worse in the cabin; just slight fumes in the cockpit; I believe the safest route was to get the aircraft on the ground as soon as possible. We expedited an Approach Checklist and set up for a visual approach backed up with an ILS.During the approach the flight attendants informed us that the smoke was dissipating; although; they could not point to place where the smoke/fumes were coming from. Also; they assured us that it was not coming from the lavatory trash cans. I informed them that we will be landing in less than 5 minutes and prepare for landing and to inform us if the situation gets worse. I informed them that Rescue Equipment would be waiting for us as we landed.We landed and used the high speed taxiway. Once we stopped; I made an announcement to remain seated to the passengers; as the flight attendants informed us that smoke and fumes had subsided. Rescue Equipment was on a dedicated frequency. They did their inspection and found no signs of external problems.We began our taxi to return to the gate when the flight attendants informed us that the fumes and smoke had returned. Also; they informed us that a passenger said there is a dark spot on one of the right flaps. With this information we shut down the #2 engine; once this was accomplished the smoke and fumes ceased.We continued and parked at gate with no other complications or issues.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.