Smoked or vaporised, salvia takes effect within a minute, peaks after about two minutes and the main effect is over within 15 to 20 minutes. Chewed, it starts after 5 to 20 minutes and lasts from half an hour to two hours. In both cases the effect can be very strong: many people lose contact with their surroundings and with their own body for part of it.
Inhaled. Peak at the first measurement, 2 minutes after inhaling; clear effects gone by about 20 minutes (Johnson et al., 2011).
Timeline by route
| Route | Starts | Main effect | After-effects |
|---|---|---|---|
| Smoked or vaporised | Within 60 seconds | 15 to 20 minutes; up to 2 hours at high doses | 15 to 60 minutes |
| Leaf chewed or held in the mouth | 5 to 20 minutes | 30 minutes to 2 hours | 30 to 120 minutes |
Source: Alcohol and Drug Foundation, Australia, updated September 2026. UK government advice gives similar figures: about 20 minutes when smoked, up to 2 hours when chewed (FRANK).
Research agrees on the smoked timeline. A survey of 32 users found effects appearing in less than a minute and lasting 15 minutes or less (González et al., 2006). In an online survey of 500 users the main effect of smoked salvia lasted 14 minutes on average, though answers ranged from half a minute to two hours (Baggott et al., 2010). The Trimbos Institute sums it up as about 10 minutes to an hour (DRUGSinfo).
What people describe
Several placebo-controlled studies, at Johns Hopkins University, in Connecticut and in Barcelona, gave salvinorin A to experienced volunteers and recorded what happened. The descriptions overlap with those from surveys of recreational users.
- Loss of the outside world. At higher doses participants often stopped responding to the researchers (MacLean et al., 2013). External sensory perception was strongly reduced (Maqueda et al., 2016).
- Body and balance. Changes in spatial orientation and a feeling of pressure on the body (Johnson et al., 2011). People may move without realising it, or find they cannot move (DRUGSinfo).
- Unusual imagery. Recurring themes in the Johns Hopkins study included childhood memories, cartoon-like images and a sense of contact with other beings (Johnson et al., 2011).
- Laughter and movement. Overlapping realities, a sense of losing the body, and uncontrolled laughter (DEA, 2025). In one study people on an active dose talked, laughed and moved more than on placebo (Addy, 2012).
- Memory gaps. Participants had trouble recalling and recognising things from during the effect (MacLean et al., 2013).
- Time. Higher doses can bring dramatic time distortion and frightening hallucinations, while low doses may cause only mild hallucinations (FRANK).
Unpredictable. What happens differs per person and per time, including the side effects (DRUGSinfo).
Physical effects
Common physical effects are dizziness, nausea, poor coordination and slurred speech; smoking irritates the throat and lungs (FRANK; DEA, 2025). Findings on the heart differ between studies. One small study found no significant rise in heart rate or blood pressure (Johnson et al., 2011); a larger one measured a rise in systolic blood pressure (Maqueda et al., 2016). The Dutch RIVM lists raised heart rate and blood pressure among the effects, together with hallucinations, restlessness, confusion and psychosis, and notes that these can occur at the amount recommended on the package (RIVM, 2022).
Afterwards
After smoking, after-effects usually fade within an hour (ADF). In a controlled study, eight volunteers showed no lasting adverse effects when checked one month later (MacLean et al., 2013). In the survey of 500 users, 4.4% reported negative effects that lasted 24 hours or longer, most often anxiety (Baggott et al., 2010).
Use tends to be occasional. The Dutch health minister wrote in 2013 that most users limit it to one or a few occasions (Tweede Kamer, 2013); in the online survey the median was six times, and 38% said the effect was unlike anything else they knew. UK government information says salvia is not considered addictive (FRANK); the DEA reports irritability, malaise and anxiety after stopping chronic use of salvinorin A (DEA, 2025).
Why the effect is hard to predict
Strength varies widely between products, even with the same "x" on the label (see extracts). The active amount is tiny, and when smoked the full effect arrives within seconds, so there is no gradual build-up in which to stop. Those two facts explain most of the difference between a mild first try and an overwhelming one.
Before any session, read safety and the sitter.