This price has not changed since 2026-09-20 10:08 UTC. It reflects the last observed trade rather than current market value, and this page is excluded from our sitemap for that reason.
Community price on backpack.tf: 10.0–11.0 keys, last changed 2021-02-28 (5.7y ago). The live quote above, 8.72 keys, is 13% lower and last moved 2mo ago. They are different measures: the quote is what traders and bots are asking and bidding on the classifieds right now, and it moves for thousands of items every day; the community price is a suggestion accepted by vote, which changes only when someone argues it should. A quote well away from the vote is usually a price that is about to be re-argued. Community prices from backpack.tf, read under an hour ago.
Steam Market asking price: $39.21 — the lowest of one listing for the Smoking effect when we looked on 2026-11-03 01:28 UTC (2d ago). This is what a seller is asking, not what anything sold for. Steam pays out in Steam wallet funds, not cash, and Valve takes roughly 15% at the till — so asking prices there run well above the 8 keys, 45.77 ref shown above, which comes from the keys-and-metal market on backpack.tf. The two are different markets and are never blended. Steam lists the item as “Unusual Professor's Peculiarity”, with no effect in the name — the effect comes from the individual listing.
Price history
Interactive chart. Press the left and right arrow keys to move along the series, Home or End to jump to either end, Escape to clear.
The key axis converts at today's rate. Prices are recorded in metal, so a line that is flat in keys followed the key rate rather than standing still.
| Observed (UTC) | Sell | Buy |
|---|---|---|
| 25 SEP 2025 · 03:29 UTC | 12.1 keys | 8.26 keys |
| 30 SEP 2025 · 20:29 UTC | 11.1 keys | 8.24 keys |
| 9 OCT 2025 · 08:13 UTC | 10.6 keys | 8.67 keys |
| 19 OCT 2025 · 19:59 UTC | 10.1 keys | 8.24 keys |
| 25 OCT 2025 · 16:17 UTC | 9.59 keys | 7.85 keys |
| 10 NOV 2025 · 00:19 UTC | 9.92 keys | 8.12 keys |
| 22 APR 2026 · 18:29 UTC | 9.93 keys | 5.52 keys |
| 29 APR 2026 · 06:29 UTC | 9.38 keys | 7.02 keys |
| 3 MAY 2026 · 22:30 UTC | 9.05 keys | 6.36 keys |
| 10 MAY 2026 · 22:31 UTC | 9.30 keys | 7.46 keys |
| 24 JUN 2026 · 09:14 UTC | 6.88 keys | 6.07 keys |
| 12 AUG 2026 · 03:11 UTC | 7.12 keys | 6.18 keys |
| 21 AUG 2026 · 04:07 UTC | 7.33 keys | 6.37 keys |
| 21 AUG 2026 · 16:08 UTC | 7.54 keys | 6.56 keys |
| 25 AUG 2026 · 18:09 UTC | 8.15 keys | 7.09 keys |
| 27 AUG 2026 · 14:08 UTC | 7.54 keys | 6.55 keys |
| 20 SEP 2026 · 10:08 UTC | 8.72 keys | 7.58 keys |
| 8 OCT 2026 · 15:09 UTC | 9.39 keys | 8.17 keys |
| 23 OCT 2026 · 13:12 UTC | 9.53 keys | 7.61 keys |
| 23 OCT 2026 · 15:12 UTC | 9.53 keys | 8.22 keys |
| 23 OCT 2026 · 17:12 UTC | 9.53 keys | 8.21 keys |
| 23 OCT 2026 · 21:12 UTC | 9.52 keys | 8.19 keys |
| 4 NOV 2026 · 03:11 UTC | 9.31 keys | 9.01 keys |
| 4 NOV 2026 · 09:11 UTC | 9.34 keys | 7.72 keys |
Price history in numbers
24 readings since 25 Sep 2025Over the last 30 days the Smoking Professor's Peculiarity's sell price ranged from 9.31 keys to 9.53 keys and is down 0.5% after 4 moves. Over a year it ranged from 6.88 keys to 9.93 keys (down 5.8%). Today's 9.34 keys sits in the middle of its range: the lowest we have recorded is 6.88 keys (24 Jun 2026) and the highest 12.1 keys (25 Sep 2025). The price has moved 21 times since we began recording it — about once every 19 days.
| Window | Low | High | Change | Moves | Readings |
|---|---|---|---|---|---|
| 30 days | 9.31 keys | 9.53 keys | −0.5% | 4 | 7 |
| 90 days | 7.12 keys | 9.53 keys | +31.2% | 10 | 13 |
| a year | 6.88 keys | 9.93 keys | −5.8% | 16 | 19 |
Details
| SKU | 384;5;u35 |
|---|---|
| Last price change | 2026-09-20 10:08 UTC |
| Key rate when recorded | 63.44 ref |
Same effect, other items
the effect across the catalogue| Item | Value | Updated |
|---|---|---|
| 2,050 keys | 12mo ago | |
| 750 keys | 12mo ago | |
| 677 keys | 12mo ago | |
| 561 keys | 4mo ago | |
| 561 keys | 12mo ago | |
| 500 keys | 12mo ago | |
| 420 keys | 12mo ago | |
| 321 keys | 1mo ago | |
| 291 keys | 12mo ago | |
| 259 keys | 1mo ago |
Other effects on the Professor's Peculiarity
same item, different effect| Item | Value | Updated |
|---|---|---|
| 1,250 keys | 12mo ago | |
| 486 keys | 3mo ago | |
| 361 keys | 12mo ago | |
| 298 keys | 4mo ago | |
| 283 keys | 8mo ago | |
| 275 keys | 3mo ago | |
| 133 keys | 1mo ago | |
| 132 keys | 1mo ago | |
| 122 keys | 1mo ago | |
| 116 keys | 2mo ago |
Priced similarly
across the catalogue| Item | Value | Updated |
|---|---|---|
| 8.81 keys | 1mo ago | |
| 8.74 keys | 1mo ago | |
| 8.88 keys | 1mo ago | |
| 8.75 keys | 1mo ago | |
| 8.81 keys | 1mo ago | |
| 8.60 keys | 2mo ago | |
| 8.66 keys | 1mo ago | |
| 8.61 keys | 2mo ago |